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<?php $array = array( 0 => array( 'key' => 'val1' ), 1 => array( 'key' => 'val2' ), 2 => array( 'key' => 'val3' ), ); $new_array = array_column($array, 'key'); print_r($new_array);
Output for 5.5.24 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => val1 [1] => val2 [2] => val3 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.4.45
Fatal error: Call to undefined function array_column() in /in/ourOD on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_column() in /in/ourOD on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_column() in /in/ourOD on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_column() in /in/ourOD on line 7