3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = null; var_dump($a--); var_dump($a++); var_dump($a += 1);
Output for 8.3.0 - 8.3.6
Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/SiQWT on line 4 NULL NULL int(2)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18
NULL NULL int(2)
preferences:
227.67 ms | 405 KiB | 329 Q