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<?php $a = array("a" => 5); echo !isset($a['d']); $b = array('test', "deb"); $c = array("sdf", "dsf"); var_dump($a + $b);
Output for 4.3.0 - 7.1.0
1array(3) { ["a"]=> int(5) [0]=> string(4) "test" [1]=> string(3) "deb" }