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<?php $arr = [['id' => 6, 'name' => 'a'], ['id' => 7, 'name' => 'a'], ['id' => 6, 'name' => 'b']]; var_dump(array_column($arr, 'id'));
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(3) { [0]=> int(6) [1]=> int(7) [2]=> int(6) }