3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "A"; if($string === 0) { echo "true"; } else { echo "false"; }
Output for 7.1.0 - 7.1.20, 7.2.0 - 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
false

preferences:
164.03 ms | 403 KiB | 158 Q