3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1,2,4,5,7); $zero = array(0); $length = 8; for ($i=0; $i < $length; $i++){ if ($a[$i] > $i + 1){ array_splice($a, 3, 0, $zero); } } var_dump($a);

preferences:
35.1 ms | 402 KiB | 5 Q