3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "a_z"; $str++; var_dump($str); $str--; var_dump($str);
Output for 8.3.0 - 8.3.22, 8.4.1 - 8.4.8
Deprecated: Increment on non-alphanumeric string is deprecated in /in/lr5vo on line 4 string(3) "a_a" Deprecated: Decrement on non-numeric string has no effect and is deprecated in /in/lr5vo on line 6 string(3) "a_a"
Output for 5.6.0 - 5.6.29, 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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28
string(3) "a_a" string(3) "a_a"

preferences:
100.2 ms | 409 KiB | 5 Q