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<?php $a = array( array('id' => 3, 'a' => 33), array('id' => 5, 'a' => 55), array('id' => 7, 'a' => null), ); print_r(array_column($a, 'a', null));
Output for 5.5.24 - 7.1.0
Array ( [0] => 33 [1] => 55 [2] => )
Output for 5.2.15 - 5.4.45
Fatal error: Call to undefined function array_column() in /in/erX00 on line 7
Process exited with code 255.