3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = $foo--; var_dump($x); var_dump($foo);
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Warning: Undefined variable $foo in /in/Bnb2D on line 3 Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/Bnb2D on line 3 NULL NULL
Output for 8.1.3 - 8.1.34, 8.2.10 - 8.2.30
Warning: Undefined variable $foo in /in/Bnb2D on line 3 NULL NULL
preferences:
68.3 ms | 862 KiB | 4 Q