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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 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/cmuQK on line 5 Warning: {closure}(): Argument #1 ($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.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/cmuQK on line 8 Warning: {closure}(): Argument #1 ($cur) must be passed by reference, value given in /in/cmuQK on line 8 Fatal error: Uncaught Error: [] operator not supported for strings in /in/cmuQK:7 Stack trace: #0 [internal function]: {closure}('val', Array) #1 /in/cmuQK(8): array_reduce(Array, Object(Closure), Array) #2 {main} thrown in /in/cmuQK on line 7
Process exited with code 255.
Output for 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
Fatal error: Uncaught Error: [] operator not supported for strings in /in/cmuQK:7 Stack trace: #0 [internal function]: {closure}('val', Array) #1 /in/cmuQK(8): array_reduce(Array, Object(Closure), Array) #2 {main} thrown in /in/cmuQK on line 7
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: [] operator not supported for strings in /in/cmuQK on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/cmuQK on line 8
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/cmuQK 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/cmuQK on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/cmuQK on line 5
Process exited with code 255.
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