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<?php $a = '052'; var_dump($a++); $c = array('052' => 'nanana'); $d = array(42 => 'batman'); var_dump(array_merge($c, $d));
Output for 4.3.0 - 7.2.0
string(3) "052" array(2) { ["052"]=> string(6) "nanana" [0]=> string(6) "batman" }