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<?php $a = array('a', 'b' ); $b = array('a_p', 'b_p' ); $c = array_merge($a, $b); $d = $a + $b; var_dump($c); var_dump($d);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(3) "a_p" [3]=> string(3) "b_p" } array(2) { [0]=> string(1) "a" [1]=> string(1) "b" }