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<?php $tests = ['derp.php', 'test.php']; array_map(function(&$test) { return substr($test, 0, strrpos($test, '.')); }, $tests); var_dump($tests);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($test) must be passed by reference, value given in /in/uSHI8 on line 4 Warning: {closure}(): Argument #1 ($test) must be passed by reference, value given in /in/uSHI8 on line 4 array(2) { [0]=> string(8) "derp.php" [1]=> string(8) "test.php" }

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