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<?php $a = array("a" => 5); echo !isset($a['d']); $b = array(1, 2); $c = array(3, 4); var_dump($a + $b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
1array(3) { ["a"]=> int(5) [0]=> int(1) [1]=> int(2) }