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.
This is easy to do in PHP: Here you modify/delete any set cookie headers that may have been set. If you call the following script after cookies have been prepared for the response header using setcookie , unwanted headers are removed and these cookies are not set in the first place. In addition, cookies set in the past (e.g. if the prevention script did not work for some reason) are also deleted.
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In JavaScript this is a little less trivial: Here we use Object.defineProperty (the powerful successor of __defineGetter__ and __defineSetter__ ) to overwrite the getter / setter methods of the document object, which are always called when cookies are used with the help of document.cookie reads and writes. Object.getOwnPropertyDescriptor receives the original getter / setter, whereby the setter is only called if the cookie is allowed:
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