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<?php $a = '052'; var_dump($a += 1); $c = array('052' => 'nanana'); $d = array(42 => 'batman'); var_dump(array_merge($c, $d));
Output for git.master, git.master_jit, rfc.property-hooks
int(53) array(2) { ["052"]=> string(6) "nanana" [0]=> string(6) "batman" }

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