3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array("hola" => 1); $b = array("como" => 2); $f = array("andas" => 3); $c = array_merge($a, $b, $f); $d = array_unique($c); var_dump($d);
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 - 5.6.40, 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(3) { ["hola"]=> int(1) ["como"]=> int(2) ["andas"]=> int(3) }

preferences:
255.06 ms | 406 KiB | 458 Q