3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "asdf"; $b = array("a", "s", "d", "f", "asdfg"); $a = array($a); $a = array_merge($a, $b); var_dump($a);
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 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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(6) { [0]=> string(4) "asdf" [1]=> string(1) "a" [2]=> string(1) "s" [3]=> string(1) "d" [4]=> string(1) "f" [5]=> string(5) "asdfg" }

preferences:
282.86 ms | 406 KiB | 311 Q