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Asked: 2026-05-17T17:32:11+00:00

Is there a function in PHP to query the number of open files? Sort

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Is there a function in PHP to query the number of open files?

Sort of like memory_get_usage() but for open files.

I’m running the unit test suites for Zend Framework. The problem is that after it gets through the tests for Zend_Search_Lucene, subsequent tests start failing. But if I skip the Zend_Search_Lucene tests, all the test suites succeed.

I’d like to prove that Zend_Search_Lucene (or any other test suite) is opening too many files and not cleaning up after itself. I thought PHP might have a function to simply report how many files are open. But after 20 minutes of searching the PHP manual and Google, I can’t find any such function.

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  1. Editorial Team

    There is no such function in PHP.

    But there are alternatives. If you are running linux/unix/OSX, then running lsof from command line can give you that information.

    This could be combined with a custom Test listener for PHPUnit – I described the approach under a different question – How to wrap PHPUnit to control command line reporting?

    PHPUnit_Framework_TestListener interface has methods like startTest(), endTest(), startTestSuite(), endTestSuite(). You could execute a shell_exec call to lsof from those methods and print out the interesting numbers before and after every test/testsuite.

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