3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array( 'a' => '1', 'b' => '2', 'c' => '3' ); $b = array( 'b' => 'b', 'd' => 'd'); var_dump( $a + $b);
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(4) { ["a"]=> string(1) "1" ["b"]=> string(1) "2" ["c"]=> string(1) "3" ["d"]=> string(1) "d" }

preferences:
345.26 ms | 406 KiB | 451 Q