How do you debug php “Out of Memory” issues?

Question

I\'ve had some issues lately with PHP memory limits lately:

Out of memory (allocated 22544384) (tried to allocate 232 bytes)

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Answer 1

Memprof is a php extension that helps finding those memory-eaters snippets, specially in object-oriented codes.

This adapted tutorial is quite useful.

Note: I unsuccessfully tried to compile this extension for windows. If you try so, be sure your php is not thread safe. To avoid some headaches I suggest you to use it under *nix environments.

Another interesting link was a slideshare describing how php handles memory. It gives you some clues about your script's memory usage.