3v4l.org

run code in 300+ PHP versions simultaneously
<?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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
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) }

preferences:
235.05 ms | 406 KiB | 354 Q