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PHP memory profiling

From what I've found online, all I've seen for tracking memory usage in an PHP application is to use the native "memory_get_usage()" function or buy a commercial product like zend server.

Anybody have some other suggestions? Seems like a good use for Aspect Oriented Programming...

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XDebug works great for tracing, profiling, and debugging.

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AFAIK XDebug only does invocation-count and time-based cost profiling, not memory.
If you look at the trace output options, you can get memory usage per-call as well. I've been using it to optimize my autoload code (which, with a few well-placed caches, brought my page load times down an order of magnitude).

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