3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(array(1),2,3); $b = array(array(1),array(2),3); $f = array(array(2),array(3),4); $c = array(array_merge($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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 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(1) { [0]=> array(9) { [0]=> array(1) { [0]=> int(1) } [1]=> int(2) [2]=> int(3) [3]=> array(1) { [0]=> int(1) } [4]=> array(1) { [0]=> int(2) } [5]=> int(3) [6]=> array(1) { [0]=> int(2) } [7]=> array(1) { [0]=> int(3) } [8]=> int(4) } }

preferences:
209.21 ms | 406 KiB | 308 Q