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<?php $array1 = array( 12 => 42, 13 => 42, 14=> 42, 15=>42 ); $array2 = array( '12' => 43, 14 => 43, 15=>43, 16=>43 ); var_dump($array1 + $array2); var_dump($array2 + $array1);
Output for 4.3.0 - 7.2.0
array(5) { [12]=> int(42) [13]=> int(42) [14]=> int(42) [15]=> int(42) [16]=> int(43) } array(5) { [12]=> int(43) [14]=> int(43) [15]=> int(43) [16]=> int(43) [13]=> int(42) }