3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a='z'; $a++; echo $a; $a++; echo $a; $a='az'; $a++; echo $a;
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
aaabba
preferences:
185.06 ms | 408 KiB | 5 Q