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<?php var_dump(array('11111' => 11111) + array('22222' => 22222, '111111' => 11111, '3333' => 3333));
Output for 4.3.0 - 7.1.0
array(4) { [11111]=> int(11111) [22222]=> int(22222) [111111]=> int(11111) [3333]=> int(3333) }