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<?php $a = array('abc' => 'ABC', 'xyz' => 'XYZ'); $b = array('none' => 'Please select…'); var_dump($a, $b); var_dump($a + $b, $b + $a);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.1.7
array(2) { ["abc"]=> string(3) "ABC" ["xyz"]=> string(3) "XYZ" } array(1) { ["none"]=> string(16) "Please select…" } array(3) { ["abc"]=> string(3) "ABC" ["xyz"]=> string(3) "XYZ" ["none"]=> string(16) "Please select…" } array(3) { ["none"]=> string(16) "Please select…" ["abc"]=> string(3) "ABC" ["xyz"]=> string(3) "XYZ" }