3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [[1, 2], [1, 2]]; $a["b"] = [1, 3]; $a["a"] = [1, 3]; $a[5] = [1, 3]; $b = ""; if (strlen($b)) echo "1\n\n\n"; array_unshift($a, [3, 4]); print_r($a);
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 - 8.3.7
Array ( [0] => Array ( [0] => 3 [1] => 4 ) [1] => Array ( [0] => 1 [1] => 2 ) [2] => Array ( [0] => 1 [1] => 2 ) [b] => Array ( [0] => 1 [1] => 3 ) [a] => Array ( [0] => 1 [1] => 3 ) [3] => Array ( [0] => 1 [1] => 3 ) )
preferences:
140.39 ms | 404 KiB | 174 Q