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<?php $array = [['key' => 5], ['key' => 6], ['key' => 7]]; array_walk_recursive($array, function(&$item) {null;}); $result = array_column($array, null, 'key'); var_dump($result);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.5 - 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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(3) { [5]=> array(1) { ["key"]=> int(5) } [6]=> array(1) { ["key"]=> int(6) } [7]=> array(1) { ["key"]=> int(7) } }
Output for 7.0.0 - 7.0.4
array(3) { [0]=> array(1) { ["key"]=> int(5) } [1]=> array(1) { ["key"]=> int(6) } [2]=> array(1) { ["key"]=> int(7) } }
Output for 5.4.0 - 5.4.45
Fatal error: Call to undefined function array_column() in /in/PNgH5 on line 5
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, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/PNgH5 on line 3
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 '[' in /in/PNgH5 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/PNgH5 on line 3
Process exited with code 255.

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