3v4l.org

run code in 300+ PHP versions simultaneously
<?php function cypher($number) { $cyphers = explode($number); $result = 1; foreach ($cyphers as $cypher) $result *= $cypher; return $result; } for ($i = 0; $i >= 100000000; $i++) { echo $i; $number = $i; for ($j = 1; $j <= 5; $j++) { $number = cypher($number); if (strlen($number) == 1) { if ($j == 5) echo $number; else break; } } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4

preferences:
171.76 ms | 405 KiB | 309 Q