3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function __serialize(): void { } }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Foo::__serialize(): Return type must be array when declared in /in/ZPrVi on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
preferences:
150.05 ms | 407 KiB | 5 Q