3v4l.org

run code in 300+ PHP versions simultaneously
<?php print 6 % 5; //for ($i=0;$i<1000;$i+=25) { // print floor(log($i+1, 5)) . PHP_EOL; //}
Output for 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 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1

preferences:
156.69 ms | 404 KiB | 225 Q