3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump("Hello, world" == 0); var_dump(NULL + 1); var_dump(NULL - 1); $x = NULL; --$x; var_dump($x);
Output for 8.3.0 - 8.3.6
bool(false) int(1) int(-1) Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/vPr0r on line 7 NULL
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
bool(false) int(1) int(-1) NULL
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 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
bool(true) int(1) int(-1) NULL
preferences:
230.05 ms | 403 KiB | 269 Q