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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, $item)?array_merge($cur, [$item[$key]]):$cur; }, []); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/vribM on line 5 Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/vribM on line 5 array(2) { [0]=> string(3) "val" [1]=> string(10) "anotherval" }

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