3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [1, 2, 3, 4, 5]; foreach ($array as &$v1) { foreach ($array as &$v2) { if ($v1 == 1 && $v2 == 1) { unset($array[1]); } echo "($v1, $v2) "; } }
Output for 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
(1, 1) (1, 3) (1, 4) (1, 5) (3, 1) (3, 3) (3, 4) (3, 5) (4, 1) (4, 3) (4, 4) (4, 5) (5, 1) (5, 3) (5, 4) (5, 5)
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
(1, 1) (1, 3) (1, 4) (1, 5)
preferences:
182.84 ms | 402 KiB | 182 Q