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<?php $a = array(a => 'a', b => 'b' ); $b = array(a => 'a_p', b => 'b_p' ); $c = array_merge($a, $b); var_dump($c);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant a - assumed 'a' in /in/I06J2 on line 3 Notice: Use of undefined constant b - assumed 'b' in /in/I06J2 on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/I06J2 on line 4 Notice: Use of undefined constant b - assumed 'b' in /in/I06J2 on line 4 array(2) { ["a"]=> string(3) "a_p" ["b"]=> string(3) "b_p" }