3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i = '1a1'; for ($i = '1a1'; $i < 10; ++$i) { echo $i; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
1a11a21a31a41a51a61a71a81a91b01b11b21b31b41b51b61b71b81b91c01c11c21c31c41c51c61c71c81c91d01d11d21d31d41d51d61d71d81d91e023456789
preferences:
250.73 ms | 404 KiB | 357 Q