3v4l.org

run code in 300+ PHP versions simultaneously
<?php $poop = array(); $arr[23] = "poop"; $arr[24] = "fart"; $result = array_merge($poop,$arr); var_dump($result); $somethingElse = $poop + $arr; var_dump($somethingElse); $poop[2] = "what"; $poop[4] = "whatever!!"; $again = $poop + $arr; var_dump($again);
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 - 7.1.25, 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(2) { [0]=> string(4) "poop" [1]=> string(4) "fart" } array(2) { [23]=> string(4) "poop" [24]=> string(4) "fart" } array(4) { [2]=> string(4) "what" [4]=> string(10) "whatever!!" [23]=> string(4) "poop" [24]=> string(4) "fart" }

preferences:
208.33 ms | 406 KiB | 324 Q