An overall average grade of \(2{,}33\) certifies suitability for high school in Bavaria, \(2{,}34\) no longer certifies one's suitability for high school. With this sharp boundary, the order of two rounds can decide which side a child lands on. The possible consequences of this rounding effect are discussed in a blog post by Günther Felbinger . Just out of interest, I calculated the effects myself across all grade combinations allowed in the model.
...Due to a mishap, all exported codes were deleted during the export process in Google Authenticator ; I had saved the recovery codes for all entries, but not the Facebook one. I had no need or urgency, as I hadn't used the social network for years, but I wanted to see if I could somehow regain access. The beginning of an odyssey.
...Sometimes a single question in the early evening program (in this case from the esteemed presenter Kai Pflaume) is enough to turn a harmless quiz show finale into a minor optimization problem. That's exactly what happens on "Who Knows What?" Master question: The category is known, the answer not yet – but the stakes already determine which outcomes are still good.
...Basic knowledge about fractions: Simplifying like factors is allowed. Simplifying like digits is not. And yet, there are fractions where this forbidden simplification seems to work. It's worth examining a particularly simple family of fractions more closely: fractions where the same digit appears at the end of the numerator and at the beginning of the denominator.
...Entertaining chess tasks sweeten life. Today's task: White's move, mate in two. The position comes from Erich Brunner in 1926 - and it is interesting precisely because it doesn't look like a typical two-move position at all. You try out direct chess bids, check rook moves, look for queen moves and after a few minutes you notice: They are not the obvious ideas.
...Some shared hosting packages with cPanel do not offer AutoSSL or only offer them at higher rates. The result: You cannot issue a free Let's Encrypt certificate via the cPanel interface, and all domains are stuck on a self-signed certificate. The browser displays the page as “not secure”. The way out: get the certificate yourself with acme.sh and install it via the cPanel UAPI - automatically renewing, without AutoSSL.
...At Who Wants to Be a Millionaire there was recently a nice little question that Günther Jauch clearly had to think about: “A number is always divisible by \(4\) without a remainder if the number formed from its last two digits...?” – and this is exactly where you have to think mathematically for a moment instead of letting yourself be lured by the pretty distractions. Because while answers like “is even”, “contains a \(0\) ” or “the cross sum equals \(4\) ” sound plausible at first glance, the correct answer is based on a simple property of our decimal system.
...Some mathematical problems are formulated so simply that they can be explained to a child, yet are so difficult that they occupy generations of mathematicians. One such problem is the so-called unit distance problem: Place \(n\) points in the plane. How many pairs of points can then have a distance of exactly \(1\) ? The problem dates back to Paul Erdős and has been studied since 1946. OpenAI has now published that an internal model has refuted a long-held conjecture about this problem.
...In October 1999, a group led by the then 16-year-old Norwegian Jon Lech Johansen released the DeCSS program to circumvent the Content Scramble System (CSS) DVD playback protection. CSS used 40-bit encryption, the keys to which were distributed to licensed manufacturers, to restrict DVD playback. Because the distribution of the code fell under the US DMCA and was legally prohibited, activists sought ways to disguise the code as a mathematical entity.
...At first glance, the rational numbers \(\mathbb{Q}\) seem like a gapless continuum: between every two fractions there is always another one. But this impression is misleading: there are sets of rational numbers that are bounded, but whose supremum or infimum simply does not exist in \(\mathbb{Q}\) . The reason lies in the existence of irrational numbers like \(\sqrt{2}\) , which, so to speak, tear invisible holes in the rational number line.
...PaperMC provides a simple foundation for extending Minecraft server-side with small plugins, without requiring clients to install anything. When developing plugins, the question arises of how to display dynamic information to the player. The answer lies in an often overlooked vanilla feature: the boss bar . Originally intended for end bosses, the boss bar can be repurposed and used as a minimalist HUD.
...The Internet Protocol (IP) is the foundation of all internet applications. Other protocols, such as TCP and UDP, build upon it, in turn carrying services like HTTP(S), email, telephony, and DNS. IPv6 is replacing the older IPv4 protocol because its relatively small address space of around 4 billion addresses has long been exhausted. IPv6 is now almost ubiquitous and more useful than many realize.
...We've all been there: You need to quickly download something from a cheap shared hosting package (e.g., from IONOS). git pull You might want to run a program or use a database, but your hosting provider doesn't grant SSH access – or only in more expensive plans. Often, the only option left is the tedious process of manually uploading files via FTP, which makes deployments unnecessarily complicated and prone to errors.
Amazon is the perfect shopping channel for freelancers: fast, affordable, and everything in one place. Amazon has now managed to consistently provide timely and readily available invoices for download (even for purchases on the Marketplace). Whether it's a new laptop, an office chair, or just a quick order of printer paper – the goods can be ordered with just a few clicks, usually via the personal account that you've had for years anyway.
...Whoever is first in the morning git status typing and then drinking coffee will love this little helper. Especially when many web projects are being developed in parallel, one is worth it compact overview: Where is the working tree clean, where are unmerged changes hanging, and where is a pull/push waiting? A small shell tool will do the trick - as long as it robustly handles spaces/Unicode in paths and doesn't choke on hanging remotes.
There's a beautiful song by Cali Rose called "It Is What It Is and It Ain't What Is Ain't ." This can be simplified to "It is what it is and it isn't what it isn't." With just a few words, entire worlds of truth can be explored. By varying and combining the two halves, a small playground for logic emerges. Now you can take this sentence and find other interesting examples.
...Thunderbird has experienced a remarkable revival since 2022. After years of stagnation, the Mozilla Foundation is once again actively investing in its development. The Supernova initiative (Thunderbird 115+) brought fundamental modernizations such as Rust integration for performance-critical components, a modernized UI based on Web Components, and native Exchange support via the EWS/Microsoft Graph API.
...In October 2019, Python 3.8 introduced the Walrus operator (:=) via PEP 572 – and thereby triggered one of the biggest controversies in the history of the programming language. The debate was so bitter that Python inventor Guido van Rossum in July 2018 – even before the release – his position as BDFL (Benevolent Dictator For Life). Since the beginning of 2019, Python has instead been governed by an elected Steering Council.
You're on the phone with a friend in the USA on a freezing cold winter day. "It's minus \(40\) degrees here!" you both exclaim simultaneously. Normally, this would be a matter of clarifying who means Celsius and who means Fahrenheit—but not at this particular temperature. Why is that? This point is the only temperature at which the Celsius and Fahrenheit scales agree!
...Most graphical file managers do not sort strictly lexicographically, but rather using “natural sort”. Blocks of numbers in the name are interpreted as numbers - the larger block of numbers wins, even if the opposite would come out in purely alphabetical terms. The idea behind natural sorting: What people mostly want is “9 before 10”, “Chapter 2 before Chapter 10”, without having to add leading zeros.
...Anyone who runs jobs in the Windows task scheduler will sooner or later stumble upon inexplicable differences in runtime. A PHP script that runs in 5 minutes on the command line suddenly takes 20 minutes when run via Windows Task Scheduler. Same user, same rights, same code – four times the execution time. What was going on there?
...The continuous decline in the price of computing power—two orders of magnitude per decade—has fueled deep learning models enormously since 2010. Larger networks plus more data seemingly reliably delivered ever-higher scores on common benchmarks—and fueled the hope that scaling alone would inevitably lead to AGI. As early as 2019, François Chollet introduced the ARC-AGI benchmark. to measure intelligence.
...The sender's email address remains a good indicator of whether an email is spam or not. By default, it's not intuitive in Microsoft Outlook Desktop to add a column that displays the actual email address instead of the name. Microsoft hasn't implemented this feature as a simple option to date – however, it can be added to the classic Windows version of Outlook using built-in tools.
...In times of HTTPS-only browsers, SameSite cookies, and realistic development conditions, it's important to work locally with genuine SSL certificates. Let's Encrypt has pioneered this approach – with the help of certbot and Cloudflare , creating and renewing wildcard certificates is quick and easy. This allows you to access your web projects encrypted on any device (smartphone, VM, etc.) on the local network or via VPN.
..."A machine can have a large memory, but it cannot think - unless we teach it." - Alan Turing. Modern AI models such as GPT-4 or Llama are based on huge data sets and complex mathematical structures. But what is really behind them? In this article, we look at the key components needed to build a language model from scratch.
...OpenStreetMap (OSM) is a free world map that is created jointly by people all over the world - free, open and independent. While Google Maps, as the market leader, is often the first choice for digital maps, OSM relies on a completely different principle: a collaborative community that collects, improves and makes geographical data available free of charge.
...Long announced - now reality : Microsoft has switched off authentication by password for certain protocols in Exchange Online from September 2022 in favor of oAuth2. The GitHub issues of many libraries and backup scripts make it clear that the changeover caught many administrators by surprise. Below we show a way how you can continue to access the contents of your Exchange mailbox with the help of oAuth2 via PHP via IMAP.
...Time not right? Email sent too early? Delaying emails can be useful in many situations: whether to give yourself review time or to effectively manage your own workload - timing can be crucial. Here are three ways you can delay sending emails and optimize your own communications.
...Browser automation plays a large role in areas such as web scraping, automated testing , and web application interaction. So far, for example, Puppeteer has been used for this purpose. With the advent of AI, new opportunities are now opening up to make browser automation more intuitive and less maintenance-intensive - clear the stage for Stagehand .
...Xdebug is a powerful debugging and profiling tool for PHP that helps us analyze and optimize PHP applications. It supports features like step-by-step debugging, performance measurement, and stack tracing, which greatly simplifies troubleshooting and provides better insights into the code. The following is a short setup guide for using it within VS Code.
...Imagine two identical cups - one filled with coffee and the other with milk, both at the same level. A teaspoon of coffee is now scooped from the coffee cup into the milk cup and stirred. A teaspoon of the mixture from the milk cup is then poured back into the coffee cup. Which cup then contains more foreign liquid?
...Commit messages in Git are often neglected. Many see them merely as a necessary evil for saving changes. However, meaningful commit messages are a crucial factor for a project's success: they ensure good traceability of changes, efficient team collaboration, and faster bug fixing. Reason enough to have commit messages prepared automatically using AI.
...February sometimes takes on an unusually appealing shape in the calendar. For example, in February 2021, one could experience such a "perfectly rectangular February." This rare effect occurs when February has exactly \(28\) days and February 1st falls on a Monday. But how often does this actually happen, and how long do we have to wait for the next time?
...CSS is still confusing for most of us: it has hundreds of poorly named properties, each of which can affect the result in non-intuitive ways. Vertical positioning of elements in web development is tricky and has often been a headache in the past, but those days are thankfully over.
...CSS transitions are a good way to create interactivity., transition to the initial state of an element, and the browser animates the transition between the two states. Transitions for intrinsic element variables such as auto have been a problem for web developers for decades, and the only option was to calculate the height dynamically using JavaScript.
There is no \(n \in \mathbb{Z}^+\), so that \(0 < n < 1\).
...In 1950, physicists George Gamow and Marvin Stern noticed an interesting phenomenon: Gamow, who had an office on the second floor of a six-story building, noticed that five times out of six, the next incoming elevator went down even though it was going up. Stern, who worked on the fifth floor, observed the opposite.
...A quine program, or quine, is a program that prints its own source code when executed. A quine must not "step out of itself" by, for example, printing the contents of the file in which it is contained or using introspective capabilities to print its own representation. Instead, it must compute its own source code.
...Powerful tools like logrotate make the work of rotating log or backup files much easier. This will rotate the files after a certain period of time or when they reach a certain size. If you don't have this tool available on a remote server and can only execute remote SSH commands, you can use a small bash script that deletes old files and only makes one request.
...In the world of numbers, we often come across surprising patterns that can be both perplexing and enlightening. One such curiosity is Benford's law, also known as the law of the first digit. This mathematical phenomenon describes the frequency distribution of the first digits in many real-world data sets and offers interesting insights into the nature of numbers as they occur in our environment.
...I have two children, a son who was born on a Thursday. What is the probability that I have a daughter? Let's denote the days of the week with the numbers \(1, 2, … , 7\) where \(1\ =\) Monday, \(2 =\) Tuesday, and so on. Now we can define the event "On day \(n\) a boy was born" as \(B_n\) and analogously for \(G_n\) .
...Assuming that the number \(Y\) of all people who have ever been born and will be born at some point is limited, let \(x\) be your absolute position from the beginning of the list. Then \(0 < \frac{x}{Y} \leq 1\). We can now say with a probability of \(95\%\) that you are among the last \(95\%\) of all people ever born, i.e. \(0.05 < \frac{x}{Y} \leq 1\) and thus \(Y < \frac{x}{0.05} = \frac{100 \cdot x}{5} = 20 \cdot x\).
...The following sentence is known as the "drinker's paradox": "There is someone in the bar, so if he or she drinks, everyone in the bar drinks." It doesn't matter whether that one person encourages others to drink or whether another back door exists, as we'll see in a moment. It is a nice example from mathematical predicate logic.
...A boy thinks of a number that is \(1\) , \(2\) or \(3\) and a girl is then allowed to ask only one question about that number. The boy can only answer " yes ," " no, " or " I don't know." By cleverly asking the question, the girl manages to name the correct number that the boy was thinking of after the boy answers her. What is your question?
...Imagine you receive a mysterious package one day, with no return address. Curious, you open it and find a ring, which you give to your daughter. Decades later, she's the one who can send objects into the past using a wormhole. She does so with the ring she once received from you, packed in a parcel addressed to you. The question is: Where did the ring come from?
...As an alternative to the highly valued Travis CI, GitHub Actions has been available for some time now. As a continuous integration tool, it is very well integrated into the GitHub code platform and is now running very stable. GitHub Actions relies on YAML configuration files that are placed in the repository where the workflow is to be executed.
...In 1961 James and Stein published the paper Estimation with Quadratic Loss . Take normally distributed data with an unknown mean \(\mu\) and variance \(1\) . If you now choose a random value \(x\) from this data and have to estimate the mean \(\mu\) on the basis of this, intuitively \(x\) is a reasonable estimate for \(\mu\) (since a normal distribution is present, the randomly chosen \(x\) is probably near \(\mu\) ).
...UUIDs (Universally Unique Id entifiers) are 128-bit values that are used in databases, among other things, to uniquely identify table entries. They are represented as a hexadecimal string divided into five groups separated by hyphens (example: 09fe49b3-4d2b-471c-ac04-36c9e706b85f). There is numerous Discussions about the advantages and disadvantages of UUIDs in databases - they are indispensable in distributed systems.
Sensitive data or excessive storage space consumption: There are good reasons to want to change the Git history. In this blog post I explained how to delete files from the Git history using BFG . A weak point of BFG is the lack of support for direct paths , so you cannot specifically remove files or folders in subfolders from the history. With that, it's time to look at alternative solutions.
...tl;dr: Manually set values or the default values of WP_MEMORY_LIMIT/WP_MAX_MEMORY_LIMIT have no effect if WP_MEMORY_LIMIT/WP_MAX_MEMORY_LIMIT less than or equal to the memory limit of PHP (hereinafter referred to as memory_limit called) is. They are used to set too low values of memory_limit dynamically to a recommended minimum.
If you embed a third-party iframe (like a widget), you can't access its content with either CSS or JavaScript (due to the so-called same-origin policy ). However, there is a very simple procedure for modifying any code (also in other files that are reloaded within the iframe). To do this, you route the URL through your own PHP proxy and modify the content as you wish.
...ANTON is one of the most popular learning apps for students in grades 1-10. Class. At first glance, the gamification aspect of acquiring coins ("coins") may seem strange to adults - but it noticeably multiplies the motivation, not only of my children. It even saves a small "cushion" of coins that you do n't touch.
...The German IBAN consists of the country code (DE), a two-digit check digit (according to ISO 7064 ), the bank code (8 digits), and the account number (including sub-account number, 10 digits, missing digits padded with leading zeros), making it 22 characters long. To calculate the check digit, a sequence is first formed from the so-called BBAN (bank code and account number), the numerical country code \(1314\) for Germany, and the check digit \(00\) .
...At our last family game night, the children enthusiastically brought out the game Dobble (the Harry Potter edition). After losing five rounds (without my card visibly matching the playing card), I was surprised to learn that every player can always find a match in every round. However, my disbelief was only met with more lost rounds – the children were simply faster.
...You know: The expected time between two Bitcoin blocks is on average \(10\) minutes. Now you are making an important Bitcoin transaction and waiting eagerly to see if and when it appears in the next block:
e50bfacc95975a4e7545d83d8954645f
...In the RKI weekly report of 11.11.2021 it is listed on p. 22 that \(36\%\) the over 60-year-old corona patients in the intensive care unit were already fully vaccinated. In this age group, \(87\%\) completely vaccinated at this point in time (see p. 18).
...Finite decimal numbers are called decimal fractions, because they are a different representation for fractions with powers of ten in the denominator. So is:
$$\frac{z}{n} = \frac{q_1}{1} + \frac{q_2}{10} + \dots + \frac{q_k}{10^k}$$
with \(k \in \mathbb{N}\) and \(q_k\) the \(k-1\) -th place to the right after the comma.
...The use of nvm is recommended for quick installation and changing of node versions. If you want to explicitly specify the required node version in a project, you put a file called .nvmrc with the exact version number (eg "12.10.0") in the same folder as the package.json . If you now change to the folder, the following extension of the file ~ / .bash_profile for bash executes the command nvm use , which automatically sets this version:
fe497e1c7f9f1547263eb3bffe15f9f6
...Since the advent of responsive web design, developers have been asking for the ability to style DOM elements based on their actual size rather than the browser viewport size (using media queries ). In fact, container queries (originally element queries) are probably the most requested CSS feature that browsers still lack .
...Sensitive data such as passwords should be stored in .env files and, if possible, not in Git repositories. However, it's probably happened to each of us at least once by mistake: quickly publishing a nice Google Maps JS API script to GitHub Gists (as "public") and inadvertently failing to conceal our own private Maps API key.
...If you want to cut out an image using an SVG, it's recommended to use the CSS property `clip-path` . The following script removes several obstacles: SVGs can be saved using Illustrator, you can specify the (relative or absolute) URL of an SVG (Chrome currently only natively supports inline SVGs), and the cutout is also completely responsive.
...Using the `meta_query` attribute in the powerful WordPress class `WP_Query`, you can filter posts that have specific values in their meta fields. If you have created a multi-line meta field (e.g., using Advanced Custom Fields ) and only want to find posts that contain a specific value in this line-separated field, the REGEX world of MySQL is recommended.
...In a previous article I described how you can easily integrate animations from Adobe Animate into a website using an APNG export. There is also the native way via the HTML5 Canvas Export , but anyone who has ever worked with it will notice that there are problems at every turn (insufficient responsive support, cumbersome integration into existing websites, no different frame rates per animation, etc.). The library adobe-animate-embed can help here.
...Normally, when integrating Google Maps, you work with the Maps JavaScript API , which requires an API key and can cause costs that should not be underestimated with higher access numbers. There are great alternatives such as mapbox or OpenStreetMap , but they do not yet achieve the variety of features offered by Google. Google itself also offers a way without an API key via the share function, which we can use for our purposes.
...Browser support for animated PNG files is now so advanced that animations created with Animate CC can easily be exported as APNG and then embedded in a web page using a simple `<img>` tag. This provides a simple and high-quality alternative to the publishing method in Animate CC, which generates JavaScript. The necessary steps are described below.
...If you want to extend the native WordPress search to include meta fields, for example, it's advisable to look at the fired filters . To ensure that pagination continues to work and that future search improvements aren't compromised, the `posts_search` hook is recommended. The following code, using the REGEXP and ExtractValue functions, extends this search to include posts that contain one of the entered search terms in all meta fields.
...Along with Xovi, the SISTRIX tool is the most widely used analysis program in Germany in the area of SEO. The visibility index has established itself as a quasi-standard for the visibility of a page in Google search. The parameters that are included in its calculation are, for example , explained here and here and here and here and here , but an exact calculation formula is not officially published. The following are the results of my six-month personal research, which do not claim to be complete or correct.
...When Kurt Gödel published his famous Incompleteness Theorems in 1931, it shook the foundations of mathematical logic: He refuted that all axioms that can be set up as a possible basis are inevitably incomplete in order to prove all statements about numbers - and destroyed that Hilbert's dream to prove the consistency of mathematical theory.
...Despite all data protection concerns, WhatsApp is still Germans' favorite messenger app. In addition to the special WhatsApp Business app, Facebook has also created an official interface, the WhatsApp Business API, to make it more interesting for companies. If you want to programmatically send WhatsApp messages from your web application, there are also other options.
...If you use elements such as overlays (which is the rule in times of GDPR actionism) and want to soften the area behind the overlay, for example, you often come across the problem of the stacking context . For example, if you have elements positioned absolutely or in a fixed position, they are suddenly displayed differently than without an applied filter. But there is a remedy.
...You don't need a powerful tool like Google Optimize for simple URL split tests; you can also implement a split test with Apache using .htaccess. The following code snippet distributes visitors from the two pages https://vielhuber.de/test1.php (Variant 1) and https://vielhuber.de/test2.php (Variant 2) evenly between both versions. The randomization is based on the current server time.
...When notating function definitions with case distinction, we use curly braces. We will pursue the simple question of whether this representation can be eliminated and the function can be traced back to a notation that can do without it. For example, can the function
$$f: \mathbb{R} \to \mathbb{R}, f(x) = \left\{\begin{matrix} 42, & \text{falls } x = 0 \\ x, & \text{sonst} \end{matrix}\right.$$
represent it in a one-line term using the four basic arithmetic operations?
...When visualizing data in Google Sheets, one encounters the problem that the \(x\) axis cannot automatically fill in the missing gaps for text values (such as calendar weeks). To solve the problem, one generates a continuous date series, counts the occurring cells themselves and then visualizes the cumulated totals.
...As part of its Google Cloud, Google offers the Google Translation API with a usage-based cost structure. In addition, there is an undocumented API that can be used without a key, but which denies service after only a few requests. When using the website translation function of Google Chrome, it is noticeable that pages can be translated here in very good quality without any noticeable limitation.
...When linking GitHub with Composer , assigning a version number via `git tag` is mandatory. The following command-line command determines the current tag and increments it (according to SemVer ) by one version number. For example, version 1.1.0 follows 1.0.9. If no tag is assigned, the version is automatically tagged with 1.0.0. Tools like flimsy or ` git hooks` shorten this lengthy tagging process.
8cd852c96ec1e60e8a5ac1f3614b2397
...Unfortunately, MySQL does not offer an ALTER TRIGGER function. To edit an existing trigger, you must first delete it and then regenerate it. The CREATE TRIGGER statement can be indirectly accessed via the information_schema . This allows us to modify triggers indirectly. To do this, make your changes in the result of the following SELECT command (after changing the database and trigger names) and execute the query.
...VanillaJS has been virtually on a par with jQuery since ES6 and is now far superior in all areas. this makes it worthwhile to gradually migrate legacy code away from jQuery. however, you have to be careful when triggering manual change events. for example, document.addEventListener does not trigger on jQuery.change(). the following overview summarizes the special features.
...The setting of cookies using your own or third-party scripts can be finely controlled using both PHP and JavaScript. Although this is not a sufficient solution for implementing cookie solutions after the court ruling against Planet49 (here it is crucial that tracking tools such as Google Analytics do not track in the first place and therefore do not set cookies), it can make sense to generally white/blacklist cookies.
...In order to save electricity or reduce your own monitoring paranoia, it is advisable to completely disconnect devices that are not in use on your own computer. Devices such as sound boxes or webcams can be deactivated / activated in the classic way via the device manager. The whole thing also works via script. The standard way of doing this used to be devcon . Windows 10 now offers a more convenient way to do this via PowerShell .
...Skype has a nice, somewhat hidden function: During video transmissions, you can easily blur the background automatically by clicking on the video button and using the " Blur my background " function. With the help of artificial intelligence, this works with any camera, even without depth information. The whole thing then appears more professional and hides private things in the background or things that are unimportant to the conversation.
...For websites that are based on WordPress , Joomla or Laravel , for example, and have no user-specific content, it is recommended to keep all pages in a static HTML cache and only regenerate the cache manually (or automatically) if there are changes in the backend. However, if the page contains dynamic content that depends on sessions and cookies or language and location, the use of OPcache is suitable.
...SVGs play a central role in today's web. not only have they displaced icon fonts, but they also offer the possibility of manipulation via CSS or JavaScript. if you want to save a vector graphic for the web from Adobe Illustrator as SVG, you have to make some settings to avoid pitfalls and reduce loading times, which I will present in the following article.
...Project Euler is a series of exciting programming problems, often with a mathematical background. The problems are frequently designed to require the development of sophisticated algorithms to achieve the goal within a reasonable timeframe. Today we'll solve Problem 15: Lattice paths , which can be solved using simple combinatorial methods.
...Since version 3.7, WordPress has natively implemented background updates and automatically enabled them for minor releases. Filters allow you to more precisely control what is automatically updated. A permanent, fully automated installation of all minor, major, plugin, theme, and translation updates is not supported, but can easily be achieved through other means.
...To extend formulas to entire columns within Google Sheets, we recommend using the useful ARRAYFORMULA function. Unfortunately, this does not work in combination with some other important functions such as QUERY or INDIRECT , which is why you have to completely customize the logic using Google Apps Script or, alternatively, manually copy the formula down to the last line.
...The Simpson's paradox is one of the easily understandable and at the same time astonishing phenomena in statistics. It occurs whenever groups of data show a particular trend, but that trend is reversed when the groups are combined. With the help of a simple example, the paradox can be understood immediately.
...The Google Tag Manager has established itself as the de facto standard for the integration of tracking scripts. In this way, on the one hand, responsibilities (online marketing vs. programming) are clearly separated and, on the other hand, you can quickly set up and modify tracking via an additional deployment channel. Here are two little tips for setting up triggers.
...From FRITZ! OS 07.10 onwards, if the internet fails, the FRITZ! Box can temporarily use the wireless hotspot of a cell phone as a fallback. The function is hidden under Internet> Access data> Internet provider> Existing access via WLAN . The FRITZ! Box then works as a router itself and provides a network with its own address range. When the Internet is available again, you simply reset the setting. I also had to check the options WLAN> Radio network> 2.4 GHz frequency band active and Internet> Access data> IPv6> IPv6 support active .
...The Flower of Life is a well-known, flower-like, geometric pattern that has appeared in temples, manuscripts, and, more recently, in popular culture for thousands of years. The pattern also plays a role in esotericism. We will disregard all of that here and focus on the simple construction of the geometric form, which consists of several evenly spaced, overlapping circles.
...The asynchronous communication medium email is - despite all the prophecies of doom surrounding Slack and Discord - the dominant communication medium in business worldwide. In addition to Inbox Zero from Merlin Mann, there are numerous other strategies for dealing with the daily flood of emails, including so-called email delaying, i.e. the delayed delivery of emails.
...For the past few days, I've been studying the following question on StackExchange about a spiral of integers. We are looking for a closed formula for the coordinates of the \(n\) -th element in the following integer spiral, which expands from the origin outwards and further and further into infinity:
.. 9 10 11 12
23 8 1 2 13
22 7 0 3 14
21 6 5 4 15
20 19 18 17 16When working with Google Sheets, you can define granular, user-based rules for editing worksheets, columns, and rows within a spreadsheet. Unfortunately, there's no way to restrict read access. This would be very helpful in many scenarios, for example, to show your customers only the tickets relevant to them, or your employees only the projects they're working on.
...npm is the default package manager for Node.js. Facebook has long been developing an alternative package management solution called Yarn . Yarn seems to be slowly disappearing from the GitHub readmes as the default solution and the stats on the official site show that only a fraction of package installations are carried out with Yarn. Nevertheless, it is worth looking outside the box.
...
The typesetting system \(\TeX\) was developed in 1977 by the legendary Donald E. Knuth, and the software package \(\LaTeX\) is still part of the standard repertoire for creating scientific papers today. The following two tools can be used to convert already generated PDFs as well as handwritten notes into TeX fully automatically. The results are quite promising.
Nick Bostrom's simulation argument is impressively simple and clearly formulated. it doesn't try to prove that we live in a simulation, but instead elegantly formulates three possibilities, one of which must be true. Elon Musk has a similar thesis, which has made the idea known to a broad public. the official paper is already over 14 years old and just as many pages short. yet the central statement is easy to understand and compact.
...the powerful plugins WPML for multilingualism and advanced custom fields for own fields are part of the basic equipment of many installations. it's annoying when malfunctions with data loss occur in interaction. the bug reports on this topic are already several years old and unanswered(here and here and here and here and here). i've taken a closer look at the problem.
...On some Android phones, both the Facebook and Instagram in-app browsers (as of today) behave incorrectly when the accept attribute is specified for an upload field within a promoted or linked landing page. The button therefore had no function. If you open the page in an external, normal browser outside of the Facebook app, everything is fine. This is annoying (especially since it has been reported for a long time), but it can be solved with a workaround.
...Google Chrome's Developer Tools are among the most powerful in the browser market. New features are added monthly, which Google presents in a condensed format on YouTube . But often it's the little things in life that bring joy. If you want to delete DOM elements in Google Chrome, you can do so with the Delete key. But only today did I realize that you can also simply move DOM elements using drag and drop.:
A golden rule in the git universe is: "Do commit early and often". If the night was a little longer, or if you just want an overview of the current situation on your own computer, the command takes you
d8a38f92d0baa14f9d4568826c13ad46
a "git status" for all repositories that are located in the current folder or in any subfolder and accumulates the values in a nice overview:
When searching for the optimal development environment, Windows 10 offers a range of options besides complete solutions like XAMPP , WAMP , and MAMP , and manual native installations , as well as virtualization solutions like Vagrant ( ScotchBox ) and Docker ( DevilBox , Laradock ). However, all solutions failed to meet my requirements—such as free configurability, true wildcard SSL certificates, access from all devices on the local network, and high stability and performance—except for one.
...One of Laravel 's strengths is its elegant syntax. If you have a lot of models and relationships in Laravel (due to a lot of tables in the database), traversing can often end in less elegant code. Over time, three small extensions have proven successful for me, which I would like to briefly introduce below. To do this we just use some inheritance, magical methods and custom collections.
...Git version control is now standard practice in almost every web project and environment (including production). Git always creates a subdirectory called `.git` , and if this is located at the same level as the website's public directory, sensitive files can be accessed publicly (for example, accessing `/.git/logs/ HEAD` displays the latest commits). This guide explains in detail how to clone another Git repository even without a directory listing.
...in an older blog post i described how to host node.js for free using heroku. now i show a way how to install node.js, npm and composer on any other shared host without root privileges with just a few lines of code. you can install packages, deploy vue.js applications or just start an express.js server. we always work in the user directory and use nvm - the node package manager.
...In PHP <7.2 you can create arrays that can no longer be accessed properly:
91367d1c4636fd753b381406024e303c
You can do some things with it.
...The following command establishes an SSH connection to a server, executes several commands (for example, changing to a subdirectory and running `git status` ), and leaves the shell open. This loads the `.bashrc` file, which enables colored subshells. The trick is to save a temporary file `/tmp/initfile` containing the desired commands and start a subshell (in our case, `bash`) with the `--init-file` command. Within this `initfile`, the same file is immediately deleted to leave no trace.
...When you map a network drive in Windows Explorer, this isn't system-wide, but only applies to the current user account. This means that an application running with administrator privileges cannot access this network drive. You can easily change this: Create a new DWORD (32-bit) value named EnableLinkedConnections with the value 1 in the registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System and restart your computer. Then, mapped network drives will be visible everywhere.
...If you want to quickly reach a local folder under Windows that you use again and again, you can simply assign it your own drive letter. There is only a detour via "Connect network drive" because you cannot specify the path C: \ Users \ David \ Downloads, for example. As a solution, enter the so-called administrative share of the drive, which exists by default for every folder: In the above example this would be \\ localhost \ c $ \ Users \ David \ Downloads .
...A frog jumps around on a number line, and the goal is to catch it. Jumping and catching alternate. The frog starts at position \(s \in \mathbb{Z}\) and with each move, it jumps a distance of \(z \in \mathbb{Z}\) (if \(z>0\) , it jumps to the right; otherwise, to the left). \(z\) is the same for each jump. Catching the frog involves specifying an integer position. Neither \(z\) nor \(s\) is known. We will show that there is a procedure that always allows us to catch the frog.
...It's not just when using npm on Windows that you come across a limit that's almost 30 years old and limits paths to folders and files to a maximum of 255 characters. It's not NTFS that's to blame here, it's LFN . This leads to annoying bugs and incompatibility between operating systems. This is an unfortunate situation in times of WSL , but luckily you have been able to fix it yourself in the registry for some time now.
...In the PHP framework Laravel, within production environments, workers like the supervisor ensure that jobs stored in Redis , for example, are executed. If you want to be completely independent of this on localhost, you can use the sync driver to execute jobs immediately. However, this has the disadvantage that the current PHP process is blocked, and the request hangs until the job has finished.
...Using the JavaScript library analytics.js from Google Analytics, any events on websites can be tracked. These events include, for example, precise measurement of dwell time, the maximum scroll depth of visitors, or other individual actions such as form submissions. If you later want to evaluate advertising campaigns or conduct A/B tests, you create so-called goals.
...Server-side rendering is now standard practice for websites and applications. Browsers like Google Chrome also tend to cache as much as possible to minimize loading times for subsequent requests. Cache invalidation of CSS, JS, and image files can be achieved using `mod_pagespeed` , the `Expires` / `Cache` control header, a cache manifest , or, more pragmatically and directly, by adding custom parameters to the filename.
...The provider Bitbucket does not offer (even in the paid tariffs Standard and Premium) the possibility to store SSH keys with write permissions on repository level. Storing your personal SSH key on the production server is not an option, because from there you have access to all other projects you are currently working on. Although there are so-called Access Keys, they only allow read permissions.
...Mark Russinovich's Sysinternals tools are essential for any Windows computer. To always have the latest version readily available, map it as a network drive. Simply run the command `net use s: \\live.sysinternals.com\DavWWWRoot` at the command line (as a regular user). This will then provide portable access to useful tools like PsList, PsKill, and Process Explorer on drive S.
...When outputting calendar weeks on a specific date, you have to be careful in Google Sheets (just like in Microsoft Excel). The function = CALENDAR WEEK (TODAY ()) calculates using the American standard, for which the first day of the year is always assigned to calendar week 1. In Germany this is defined differently: Here the first calendar week is the week from which at least 4 days fall into the new year. In Google Sheets you can solve the problem (in addition to other, exciting alternatives like = SHORTEN ((TODAY () - DATE (YEAR (TODAY () - REST (TODAY () - 2; 7) +3); 1; REST (TODAY ( ) -2; 7) -9)) / 7) and the modified = CALENDAR WEEK (TODAY (); 21) ) easily with the specially designed function = ISOWEEKNUM (TODAY ()) .
...Since Let's Encrypt , encrypted websites have become standard practice. SSL certificates are also virtually indispensable in local development (for example, navigator.geolocation requires SSL encryption locally). Since Chrome version 58, support for CN (Common Name) has been dropped, and SAN (Subject Alternative Name) is now mandatory. As a result, Chrome no longer accepts any SSL certificates created using traditional methods .
...Consider two people \(A\) and \(B\) who do not have the same birthday, where \(A\) is younger than \(B\) . Show: There are exactly two age constellations \(a,b \in \mathbb{N}\) for which the following applies: \(2\cdot a = b\) . We first set \(d \in \mathbb{R}^+\) as the age difference between \(A\) and \(B\) at the birth of \(A\) with \( d = d_0 + d_1 \) , \( d_0 \in \mathbb{N}_0, d_1 \in \mathbb{R}, d_1 \in [0;1[\) . We now consider an arbitrary time \(x \in \mathbb{R}^+\) after the birth of \(A\) with \(x = x_0 + x_1\) , \(x_0 \in \mathbb{N}_0, x_1 \in \mathbb{R}, x_1 \in [0;1[\) .
...Since Git doesn't know folders, only files, empty folder structures don't end up in the repository. Since many frameworks and projects absolutely need these, they should end up there. A common practice is to create so-called placeholder files (often called .gitkeep), which implicitly specify the folder structure. You can easily create these files and, if desired, ensure that other files in the folders are ignored.
...hosting for node.js is still not very widespread, especially in the german-speaking world. here, the american cloud company heroku offers a remedy - and even for free. you always notice the paradigm "build apps... not infrastructure" and yet you have hardly any restrictions. we implement a small cronjob based on phantomJS as an example, which scans a website every day and sends the page title via email.
...In addition to the diagonal arguments , Georg Cantor also developed the Cantor pairing function \(\mathbb{N}^2 \to \mathbb{W}, \quad c(x,y) = \binom{x+y+1}{2}+x = z\) , which encodes any two numbers \(x,y \in \mathbb{N}\) in a new number \(z \in \mathbb{N}\) . For example, \(c(3,4)=\binom{3+4+1}{2}+3 = \binom{8}{2}+3=\frac{8!}{6!\cdot 2!} +3 = 31 = z\) a unique coding of the numbers \(3\) and \(4\) in the number \(31\) . Show: The set of values \(\mathbb{W} = \mathbb{N}\) , ie \(z\) assumes all natural numbers.
...Consider the earth (as a sphere with \(r_1 = 6370km\) ) and a pea (as a sphere with \(r_2 = 2mm\) ) and stretch a rope across the equator so that it lies tightly on the surface. Now extend both ropes by one meter each. Both cables should now lie completely extended above the equator - but they are no longer completely on the surface, but float above the equator. How high above the surface does the rope float above the earth, how high above the pea?
...In how much % of the time of a day are all three hands of an analogue watch located in the right half of the dial? First of all, the hour hand is located on the right side of the dial in 12 of 24 hours (50%). Of this time, the minute hand is located on the right side in 6 of 12 hours (25%). Of these 6 hours, the second hand spends 3 hours on the right side (12.5%).
...Laravel makes communication with the database much easier with Eloquent. When working with Eloquent Relationships, when calling dynamic variables (using PHP's magic methods ), you should be aware that the instances of the models do not reflect new changes, but rather cache them permanently the first time they are called.
...When hosting Git on Bitbucket , there is a hard limit of 2 GB - if this is exceeded, you only have read-only access to the repository. To prevent this, you can, for example, retroactively remove large folders or files from your commits. But in other cases too (if access data has found its way into the history or node_modules has slipped to master again) you have to retroactively manipulate Git's history, contrary to its nature.
...In the age of Let's Encrypt, encrypted websites are now standard. However, wildcard or extended certificates with particularly trustworthy owner validation are also frequently required. DomainFactory offers cost-effective SSL certificates that can also be used externally. Setup on a current IIS server is possible without a CSR using OpenSSL . Below, I'll briefly outline the necessary steps.
...In 1987, Thomas M. Cover posed the following astounding question in "Open Problems in Communication and Computation": Player \(X\) writes two different and randomly chosen natural numbers \(A\) and \(B\) on two different pieces of paper and places them face down on a table. Player \(Y\) now randomly chooses one of these pieces of paper, sees the number and must now decide whether this number is smaller or larger than the other number that is still face down on the table.
...When a soccer game starts, the ball lies in the center of the field and is then moved around the field for 45 minutes by shifting and turning. At the beginning of the second half the ball is again on the center of the field. We show with simple means of linear algebra that either an infinite number of points on the surface are always in exactly the same position as in the original state or exactly 2.
...When debugging blade templates in Laravel 5.* you often get meaningless error messages pointing to cached views. Everything used to be better: the debugging view in version 4 contained more helpful functions and was also visually more attractive. With a few lines of code you can get this functionality back with the help of whoops (“PHP errors for cool kids”).
...whether references, partners or customers - there are many cases where you want to display several logos next to each other in a harmonious way. the proportions of the logos are usually not uniform. often you follow your gut feeling when it comes to the size representation in the design, but there is also an exact calculation method of a visually appealing representation by equating the areas of the logos. in the following example, this can be done with a few lines of JavaScript.
...During your daily work with variables in PHP and JavaScript you often come across the query whether a variable is empty. It is worth knowing the native functions and their differences for checking. Annoyingly, there is no simple method to intuitively check whether a variable exists or not. What is meant by this is illustrated in the following matrix. However, small helper functions can be used to retrofit the desired function.
...With sipgate .io S ipgate has created an exciting cloud API which offers a wide range of possibilities around internet telephony. One account is free of charge, and in the Feature Store you can set any free sender number. The documentation of sipgate.io is still expandable, but with a little bit of reading into the official Sipgate API you can quickly realize exciting things.
...Relational database management systems based on SQL are only partially suitable for hierarchical or recursive queries. Other systems like ArangoDB are better suited for this (there was a great talk about this at GOTO 2016 ). However, it is also possible to create recursive queries in SQL using Common Table Expressions , allowing you, for example, to query classic parent/child tables for all ancestors and descendants.
...According to w3techs.com , around 27.4% of all websites worldwide are currently operated with the help of WordPress. In very many cases, these are not blogs. WordPress automatically generates numerous, often unused URLs and produces so many links indexed by Google that the website operator did not even have on the screen. All of this can be deactivated with a simple command.
...If you get into the predicament of renaming thousands of form field names like I did, you can use the JavaScript console included in Acrobat, where you can not only execute arbitrary JavaScript code, but also access all contents within the PDF (including form fields). Since there is no native renaming function in the JS-API, the form fields are copied with all their properties and created with new names.
...In Shopware 5, a known problem has still not been resolved: If you create an article with mutually dependent variants with mutually exclusive configuration options, it can happen that some combinations cannot be selected in the front end and therefore cannot be ordered. With the help of a plugin, the problem can be easily fixed at the moment.
...There are numerous proofs of the infinity of prime numbers - the well-known theorem of Euclid from the Book of Elements is not missing in any basic lecture on number theory. 2015 Sam Northshield published in the American Mathematical Monthly (issue 122) a no less elegant proof of contradiction in the form of a one-liner, which I do not want to withhold from you (with short comments).
...You can visually enhance the despicable Windows Command Prompt with a few simple steps. You can not only customize the command line in terms of color and size, but also extend its functionality (increase the buffer, install a large set of UNIX tools). Although the command prompt does not come close to PowerShell 6.0 or the new Windows 10 Bash Shell, it can be used for everyday tasks.
...In content management systems, URLs are often not predetermined and therefore not created statically (as posts or menu items) in advance, but rather access objects from the database. Similar to WordPress ( as described here ), it's also possible to create dynamic URL structures in Joomla (independent of the internal alias system). This can be achieved either with JRouter – or with a single line of code in the .htaccess file.
...Modern browsers can use JavaScript to access and manipulate the user's clipboard, both reading and writing. The underlying technology is nothing new, but only recently have more and more attacks (known as "pastejacking") emerged online, exploiting this capability to the detriment of unsuspecting users. Implementing this in JavaScript is quite simple.
...Swapping SQL table columns is part of the standard repertoire with MySQL - this is not (yet) supported with PostgreSQL. Although the official wiki devotes its own article to the problem, it does not show any practical solution that also supports views, indices and triggers. The following class does this job (for both MySQL and PostgreSQL) either on the command line - or alternatively directly in Laravel 5.
...If you want to quickly open the command prompt in a folder in Windows Explorer, you right-click (one level up) on the folder and hold down the Shift key and select "Open command prompt here" from the context menu. I just found out another, faster method when you are inside the folder: Here you click into the current folder path, type "cmd" and confirm with Enter.
...When working with hierarchical categories (taxonomies) in WordPress, you'll notice that the display of selected categories in the backend can be confusing, and posts don't automatically end up in their parent category when they're moved to a child category. Both of these issues can be easily resolved with just a few lines of code using the powerful hook system (in the form of an action and a filter).
...Besides new features like type hinting for scalar datatypes or the optimized performance, PHP 7 also brings many new, useful language extensions, and finally the "spaceship operator" has made it into the world of PHP (Ruby and Perl programmers have known it for a long time). \($a <=> $b\) returns \(0\) if both operands are equal, \(1\) if the left one is larger and \(-1\) otherwise .
...If you integrate PHP via FastCGI on IIS 7.5, every script is aborted by default after 600 seconds (i.e. 10 minutes). Changing the well-known variable "max_execution_time" in php.ini has no influence on this; you must (also) adjust the FastCGI settings. For this purpose, IIS offers a convenient interface for managing the relevant variables.
...Conditional probability theory entails beautiful tasks with counterintuitive solutions. In addition to the well-known sibling problem, I will now briefly deal with another example: "I now have two children. One of them is a boy and was born on a Thursday. What is the probability that the other child is also a boy?"
...the file version management system git is slim, fast, and portable. git always handles objects, namely files. folders are only created if there are files in them, otherwise git doesn't capture them in the first place. this has unpleasant side effects in some projects. for example, the shop system shopware relies on strict adherence to the folder structure to function.
...Shopware has a powerful shipping cost module that you can specifically intervene in the calculation. In our case, we want to implement the following scenario: The shipping costs per article are initially determined according to the weight of the article (the weight limits are specified). Only for special exceptions should it be possible to set fixed shipping costs for each item.
...The WordPress permalink system can be adapted very well to your own needs with the help of structure tags . The setting% postname% is probably the most common and practicable solution. However, if you want to implement real dynamic links, you first have to expand the system with your own code.
...One would expect that opening hyperlinks from within a Word/Excel document would launch the default browser with the desired URL. Oddly enough, this is not the case – leading to undesirable side effects and making links to session- or cookie-based login-protected pages impossible in these Office programs.
...On this Father's Day, a daughter gives her father a self-painted picture that her father has long wished for. The daughter says: "I am giving you the picture that you wished for, and my gift will be a surprise". The father trims and reflects on the truth of this statement.
...If you include unencrypted scripts in the <head> area and call up a page with an existing SSL certificate encrypted, these scripts are blocked and therefore not executed. If you simply omit the protocol, all scripts are automatically called in encrypted form if the website is accessed via https: // - otherwise unencrypted.
...When working with multi-dimensional dropdown menus, you often encounter the problem of accidentally opening the wrong submenu or accidentally closing the desired submenu. This occurs when the mouse cursor leaves the corresponding menu at the top level while navigating to an already expanded submenu.
...The following scenario always results in an undesirable side effect: If you protect your site with htaccess/htpasswd and simultaneously enforce an SSL connection, you always have to enter the same password twice (once for http and again for https after successful entry). This problem can be easily solved using the configuration sections introduced in Apache 2.4.
...When programming with JavaScript, you often stumble over the missing possibility to realize multi-line strings by entering them in the code. While the task is no problem in other languages such as PHP or Ruby, JavaScript can only be solved with workarounds, the use of which depends on personal taste and browser support.
...Sending emails with PHP is best implemented with powerful classes such as PHPMailer . Convenient wrapper functions make it possible to use UTF-8 content, embed images and send encrypted attachments with just a few lines of code. If you want to save yourself the overhead and, contrary to the recommendation, use the PHP function mail () , you will run into problems when using umlauts and UTF-8 at the latest.
...Validation tools like the W3C Markup Validation Service or Google PageSpeed Insights are helpful for objectively evaluating a website's code and performance. Google, in particular, influences an entire industry with concepts like "above the fold" and also sets strict but useful guidelines regarding image compression and caching. However, in doing so, Google can sometimes trip itself up.
...JavaScript dominates the web – and ECMAScript, the core of the language, is maturing. The new specification (ES6 or JS2), expected mid-year, brings numerous innovations that can already be tested. Firefox currently offers the best support , but polyfills via transpilers like Google Traceur are also possible. A brief overview of the new features of ES6 follows.
...Whether at school or at university: An interesting question that \( 0,99999... = 1 \) and then includes the question of whether the following equation is true: \( 0,99999... = 1 \) . Although infinity \(0,99999... = A\) in the left part of the equation, we give it a name: \(0,99999... = A\) . After multiplication by the factor \(10\) and simple algebraic transformations, we get a first astonishing insight.
...Just now I was confronted with the following performance problem of a SQL database: In a SQL table called "users" with ~1,000,000 entries, it took an unbearable 28 seconds to determine the number of registrations on today's day. In the "created" column, the times of the registrations were stored in the format "Y-m-d H:i:s".
...Besides the well-known knight problem and queen problem, there are many other exciting questions in the world of chess. I have touched on two small curiosities in a previous blog entry. If you deal with chess problems mathematically, you will soon realize that mathematics provides very simple and enlightening answers to many questions.
...If OneDrive, Dropbox, Google Drive, OwnCloud, box.net: Regardless of the box in which you store your files - the services are almost the same. The clients available for all desktop and mobile systems, the standard unencrypted files and the sharing options differ only marginally. But the OneDrive, which has been integrated into the system since Windows 8.1, has a special feature: only files available online.
...Files on web servers should always be stored without spaces (not "this is an image.jpg"), without umlauts or special characters (not "football.jpg"), without backslashes (not "work\car.jpg"), and in lowercase (not "test.JPG"). Recently, however, for a client project, I had to access and process a large number of predefined files with arbitrary filenames.
...Today I came across the following task while working on a customer project: Take a SQL table "user" with the columns "id" and "score" and determine a ranking list of all users, sorted based on "score", in which users with the same score get the same ranking. By using user-defined variables, this task can be solved intuitively and easily.
...When working with the Facebook SDK (more precisely when implementing a Facebook login function within a REST interface), the transmitted token that the client has received from Facebook must first be checked for validity by the server before further operations are performed.
...Whether Chrome, Firefox, Opera, Safari or even Internet Explorer: While well-engineered developer tools were a unique selling point of Firefox and the popular Firebug plug-in until a few years ago, powerful developer tools are now part of the standard scope of every browser in which there is a lot to discover gives.
...I recently stumbled upon a neat way to access the file system and retrieve valuable information, such as the existence of files and folders or their contents. This can be very helpful as an alternative to the PHP function ` file_exists` , since the information about the existence of the file(s) can be used in the query for further sorting and aggregation functions.
...animated vector backgrounds can bring variety to a web landscape dominated by full-screen photos and videos. it would be nice if loading times as well as broad hardware and software support went hand in hand with this. one solution is called canvas. the JavaScript-controlled HTML element is supported by all current browsers and can be displayed with high performance on mobile devices.
...As a web developer, you often find yourself in the dilemma of working with HTML elements that - unlike the img element, for example - have neither a fixed size nor a fixed aspect ratio. Often you want to ensure that these objects behave responsively, but the proportion between width and height is maintained. By default, CSS does not offer an intuitive solution here. But with the help of the vertical padding property you can achieve your goal.
...After the Cologne Regional Court backtracked last week in the RedTube scandal and should never have authorized the release of the controversial IP addresses, it has now delivered another highly controversial and questionable ruling with decision 14 O 427/13: The author of stock photos from a specific image agency must also be named when his images are accessed directly via their URL.
...The innovations of the HTML5 specification are numerous and many of them are already supported by the majority of the browser landscape - below I would like to highlight an interesting change to the rules for nesting elements. HTML has always distinguished between block and inline elements. For example, HTML4's Document Type Definition lists h1, p, and div as block elements and a, span, and img as inline elements.
...Both Apache on Unix and IIS on Windows systems log HTTP requests out-of-the-box in file form. To protect against hacking attacks, queries to your own website should be regularly evaluated and analyzed manually and automatically (for example using log file analyzers such as AWStats ). For example, in widely used configurations, the paths of the relevant log files are as follows:
/var/log/apache2/access.log(Example: Ubuntu 12.04, Apache 2.2)C:\inetpub\logs\LogFiles\W3SVC1\u_ex<YYMMDD>.log(Example: Windows Server 2012 R2, IIS 8.5)
When integrating Joomla 3.2 on a Windows Server 2008 R2 with IIS 7.5, problems with directory rights often arise, which are often inadequately resolved with settings that are too generously chosen. The following solution is safe and fully functional:
- The group IIS_IUSRS needs the following permissions for C:\inetpub\wwwroot\: read & execute, view folder contents, read, write
- The IIS_IUSRS group needs the rights for C: \ Windows \ Temp \: Read & Execute, Show folder contents, Read, Write
- The user IUSR must be in the group IIS_IUSRS (Computer Management > Local Users and Groups > Groups)
If you need additional special directory rights (for example for SSH or FTP) for all files uploaded via PHP, you should also set these for the C:\Windows\Temp\ folder. If you upload a file via PHP, PHP first copies this file to the temporary path and then to the final path. If the file ended up in the temporary directory, it inherits its rights and retains them after being moved to the final directory.
...In times of the NSA scandal, not only net-savvy users are asking themselves the question of whether and how they can move anonymously on the net to escape the data collection mania of the authorities and secret services. However, this often leads to mistakes and false assumptions. A central misconception is the reduction of anonymity to the concealment of the IP address.
...The discount fitness chain McFIT is giving itself a new face. While a bright yellow mascot in the shape of a banana used to adorn the blue lettering, now a yellow bow on an anthracite-colored background skilfully wraps itself together, forming an abstract structure. The FDP colors blue and yellow not only appear on the logo, but also on all other printed items from the McFIT brand.
...When the brothers Thomas and John Knoll started developing Adobe Photoshop in 1987, I wasn't yet born. Today, in 2013, the software is one of the most popular programs in general and is considered the undisputed leader in the image editing sector. Thanks to Adobe and the Computer History Museum, the software will now be preserved for posterity in a very special form.
...Chess has fascinated for centuries - its rules are easy to learn and its incredible depth is only accessible to experienced players (of whom I unfortunately do not count). In the following, I will deal with two entertaining questions: Is it possible, by a correct sequence of moves, to reach a position in which the black king is attacked by two white queens at the same time? Is this also possible by two white rooks?
...Movies are usually recorded and played back at 24 full frames per second - but the almost 100-year-old standard format "24p" seems to be wobbling. In order to prevent the unpleasant side effects (e.g. the strong jerking during medium-fast camera panning) of the 24fps projection, work has been underway for a long time on doubling the frame rate to 48 frames per second and more.
...Automated spelling and grammar checking is now standard equipment in word processing programs - but checking the spelling of a website automatically has been relatively cumbersome up to now. Google Chrome is taking a first step in this direction with an integrated check in multi-line input fields (textarea). Now there is a service that makes this possible for entire websites.
...Should domain names and email addresses always be lowercase to make sure you get where you want to go? Or is this completely irrelevant? Google's mail servers, for example, have strange settings with interesting effects, which I will briefly introduce below.
...I closely follow the design of various programs on German television. Hardly any program retains its corporate design permanently. The evening ritual of the meeting in front of the television screen at 10:15 p.m. on the topics of the day has been causing me stomach ache lately: For some months now, a completely confusing color scheme has been chosen for the presentation of the current stock exchange prices.
...If you optimize your own website for mobile devices, you should not only pay attention to different screen sizes, optimized loading times and special features in operation (such as hover effects), but also take into account the special capabilities of the devices. This also includes (some people may have forgotten) making phone calls.
...Google often penalizes identical content across multiple websites—however, the Google algorithm is intelligent and recognizes whether the elements in the header and footer are consistent or whether entire text passages are accessible twice under different URLs. The question of how Google handles blog article overview pages is particularly interesting.
...The security of WordPress, currently the most popular content management system, can be significantly improved by tweaking two small settings. This only takes 5 minutes and two lines of code. While the issue can also be addressed with a variety of plugins, I will deliberately limit myself here to plugin-free solutions.
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