3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo {}; var_export(is_a(NULL, Foo::class));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.6
false
preferences:
298.57 ms | 1107 KiB | 4 Q