3v4l.org

run code in 300+ PHP versions simultaneously
<?php for($i=0; $i<256; $i++) echo !ord(chr($i)) == $i;
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
187.12 ms | 403 KiB | 210 Q