3v4l.org

run code in 300+ PHP versions simultaneously
<?php function autoLoadClass($name) { echo 'spl_autoload_register: ', $name, '<br>'; } spl_autoload_register('autoLoadClass'); class_exists('Foo', false); class_exists('Bar', false); class_exists('Foo\\Bar', false);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
preferences:
285.9 ms | 404 KiB | 388 Q