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<?php $arr = array(0 => array("key" => "val"), 1 => array("key" => "anotherval")); $key = "key"; $result = array_reduce($arr, function(&$cur, $item) use ($key) { return $cur=array_key_exists($key, $item)?$cur[]=$item[$key]:$cur; }, []); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/cmuQK on line 5 Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/cmuQK on line 5 Fatal error: Uncaught Error: [] operator not supported for strings in /in/cmuQK:7 Stack trace: #0 [internal function]: {closure}('val', Array) #1 /in/cmuQK(5): array_reduce(Array, Object(Closure), Array) #2 {main} thrown in /in/cmuQK on line 7
Process exited with code 255.

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