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<?php $a = array('a', 'b'); array_push($a, array(1, 2)); var_dump($a);
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> array(2) { [0]=> int(1) [1]=> int(2) } }