Perplexed Labs » memory leak http://blog.perplexedlabs.com web development war stories from the frontlines to the backend Thu, 09 Sep 2010 17:11:02 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 PHP garbage collection and memory leaks http://blog.perplexedlabs.com/2008/02/25/php-garbage-collection-and-memory-leaks/ http://blog.perplexedlabs.com/2008/02/25/php-garbage-collection-and-memory-leaks/#comments Mon, 25 Feb 2008 17:57:33 +0000 Matt http://www.perplexedlabs.com/2008/02/25/php-garbage-collection-and-memory-leaks/
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    • ]]>     Been working on a command line script that takes days to finish execution (yes, DAYS).  Unfortunately, it had a healthy flow of memory leaking. It would fatally crash with your typical "out of memory" error.

    I spent hours debugging the potential source - free'd results of mysql queries, unset variables, you name it I tried it.  I kind of gave up and instead chose to add in a "start at" parameter so that I could just re-execute and jump back in to the loop where it crashed last time.

    Today, through natural processes of improving functionality and cleaning code, I moved the block of code that was leaking memory into a function so that it could be recycled elsewhere.  By simply moving the code into a function I suspect PHP now garbage collects after each call and memory no longer hemorrhages from its veins.

    I hope this helps someone else out there!

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    1. PHP jQuery AJAX Javascript Long Polling
    2. Mutex with PHP and mySQL
    3. PHP Simple Profiling Class

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