3v4l.org

run code in 300+ PHP versions simultaneously
<?php function bar($t, $m) { echo $m;} function foo() { echo 'X'; restore_error_handler(); set_error_handler('bar'); $a = $c; } set_error_handler('bar'); set_error_handler('foo'); $a = $b; print_r( set_error_handler('var_dump') );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
XUndefined variable $cbar
Output for 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, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
XUndefined variable: cbar
Output for 5.0.4
XUndefined variable: cfoo
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.3
XUndefined variable: cfoo
Output for 4.4.0 - 4.4.9
XUndefined variable: cbar
preferences:
242.91 ms | 401 KiB | 344 Q