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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 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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" }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/vribM on line 8 Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/vribM on line 8 array(2) { [0]=> string(3) "val" [1]=> string(10) "anotherval" }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array(2) { [0]=> string(3) "val" [1]=> string(10) "anotherval" }
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/vribM on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/vribM on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/vribM on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/vribM on line 5
Process exited with code 255.
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312.66 ms | 401 KiB | 460 Q