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<?php $arr = array('key' => 'value'); //array_map(function($k, $v){var_dump($k, $v);}, array_keys($arr), $arr); array_map(function(&$a){ var_dump(key($a)); }, $arr);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($a) must be passed by reference, value given in /in/P2ul8 on line 5 Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, string given in /in/P2ul8:7 Stack trace: #0 /in/P2ul8(7): key('value') #1 [internal function]: {closure}('value') #2 /in/P2ul8(5): array_map(Object(Closure), Array) #3 {main} thrown in /in/P2ul8 on line 7
Process exited with code 255.

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