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AllenJB/oom_example.php

Created December 3, 2022 10:35
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  1. AllenJB created this gist Dec 3, 2022.
    24 changes: 24 additions & 0 deletions oom_example.php
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,24 @@
    <?php
    ini_set('memory_limit', '2M');

    function shutdownHandler()
    {
    print "Shutdown handler triggered\n";
    print "Memory limit: ". ini_get('memory_limit') ."\n";
    // If the next line is commented, a second OOM will be triggered
    ini_set('memory_limit', '-1');
    print "Memory limit: ". ini_get('memory_limit') ."\n";
    print "Mem usage: ". memory_get_usage(true) ."\n";

    $a = '';
    $a .= str_repeat("Hello", 1024 * 1024);
    print "Mem usage: ". memory_get_usage(true) ."\n";
    }
    register_shutdown_function('shutdownHandler');

    print "Memory Limit is: ". ini_get('memory_limit');

    $a = '';
    while (true) {
    $a .= str_repeat("Hello", 1024 * 1024);
    }