Sara Golemon has a bit of a warning for those extension developers moving between PHP 5.2 and 5.3 - the Module API isn't 100 percent compatible.
Unlike PHP, C generally resolves function calls at compile time. When you introduce dynamically loadable shared objects, the ability to know their exact address ahead of time goes out the window [...] One of the things that makes this unnecessarily slower is libraries which export a lot of symbols which aren't...
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