3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [1,2,3,4]; var_dump($arr); // incorrect way: $arr = [1,2]; var_dump($arr); //correct way $arr = [1,2,3,4]; $arr[] = [1,2]; var_dump($arr);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) } array(2) { [0]=> int(1) [1]=> int(2) } array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> array(2) { [0]=> int(1) [1]=> int(2) } }
preferences:
135.27 ms | 408 KiB | 5 Q