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<?php $files1 = array('AAA', 'BBB', 'CcC'); $files2 = array_filter($files1, function ( &$path ) { $path = strtolower($path); return true; }); var_dump($files1, $files2);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($path) must be passed by reference, value given in /in/dp6Lt on line 5 Warning: {closure}(): Argument #1 ($path) must be passed by reference, value given in /in/dp6Lt on line 5 Warning: {closure}(): Argument #1 ($path) must be passed by reference, value given in /in/dp6Lt on line 5 array(3) { [0]=> string(3) "AAA" [1]=> string(3) "BBB" [2]=> string(3) "CcC" } array(3) { [0]=> string(3) "AAA" [1]=> string(3) "BBB" [2]=> string(3) "CcC" }

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