3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = null; $x++; var_dump($x); $x--; var_dump($x); $x = null; $x--; var_dump($x);
Output for 8.3.0 - 8.3.4, 8.3.6
int(1) int(0) Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/bmu4L on line 10 NULL
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 int(1) int(0) Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/bmu4L on line 10 NULL
Output for 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
int(1) int(0) NULL
preferences:
171.25 ms | 402 KiB | 156 Q