3v4l.org

run code in 300+ PHP versions simultaneously
<?php $ref = "PHP 5"; $x = $ref; echo "$x\n"; $x++; echo "$x\n"; $x = $ref; echo "$x\n"; $x = ++$x; echo "$x\n";
Output for 8.3.0 - 8.3.7
PHP 5 Deprecated: Increment on non-alphanumeric string is deprecated in /in/r06nt on line 1 PHP 6 PHP 5 Deprecated: Increment on non-alphanumeric string is deprecated in /in/r06nt on line 1 PHP 6
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.6, 4.4.8 - 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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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
PHP 5 PHP 6 PHP 5 PHP 6
Output for 4.4.7

Process exited with code 143.
preferences:
197.44 ms | 401 KiB | 313 Q