How can I find out whether a PHP script goes bad and runs really slow when ran by hundreds of users every second, and better yet, is there any tool that could tell me approximately which part of the code slows me down?
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I don’t wish to post the code here (mainly because this question refers to something else and because it’s a waste of space) and preferably never post it anywhere because it’s actually a mess!… a mess that I understand and yes, i coded it, but still a mess which would insult anyone trying to comprehend it… so if you have any creative ideas, please let me know!
Cheers!
( thank you already for your incoming answers! )
Enable XDebug profiling, and send the resulting files through WinCacheGrind (Windows) or KCacheGrind (Linux).
This will allow you to see a breakdown of which functions get called most, and where the time is spent. Learning to use XDebug is a must for any serious PHP developer.
Here is a seemingly good tutorial on getting started with XDebug profiling.