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<?php $a = array('01'=>1, '02'=>73); $b = array('10'=>11, '11'=>23); var_dump(array_merge($a,$b));
Output for 4.3.0 - 7.1.0
array(4) { ["01"]=> int(1) ["02"]=> int(73) [0]=> int(11) [1]=> int(23) }