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run code in 150+ php & hhvm versions
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<?php $tests = ['derp.php', 'test.php']; array_walk(function(&$test) { $test = substr($test, 0, strrpos($test, '.')); }, $tests); var_dump($tests);
Output for 5.4.0 - 5.4.28
Fatal error: Only variables can be passed by reference in /in/5FgYB on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '[' in /in/5FgYB on line 2
Process exited with code 255.