Do not use
remove_filter(). It is possible it will break other hooks which can have unintended consequences. This post gives a really good alternative approach using static variables.
Worth to know for wordpress plugin authors: Making your plugin to safely unregister or remove a hook (filter or action) is not possible with the wordpress plugin API. Why? you might ask yourself. Even the name of the remove_filter() function suggests it and the codex documentation does say so as well.
But: It does not work, because this function does not work as intended. And beyond your own hooks, it has the potential to hinder the blog from working properly as it has the potential to remove other hooks then the specified one.
Does not is not exactly right, it does, but only sometimes. That’s specifically a bummer if you write plugins yourself, because you can not safely rely on it. For example, if running your plugin makes use of PHP 5.2 or greater it works. But it does not if it’s running on PHP 4 or PHP 5 lower…
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