3v4l.org

run code in 300+ PHP versions simultaneously
<?php function factorial($number) { $factorial = 1; if ($number > 1) { $factorial *= $number; echo $factorial; $number--; factorial($number); } else { return $factorial; } } var_dump(factorial(5), factorial(0));
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 - 8.3.26, 8.4.1 - 8.4.14
5432NULL int(1)
preferences:
164.82 ms | 408 KiB | 5 Q