3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A0 {}; class A1 extends A0 {}; $a = function ($a) : A0 {return $a;}; $a(new A1());
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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, 8.3.0 - 8.3.6
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/5WXK8 on line 5
Process exited with code 255.
preferences:
289.66 ms | 402 KiB | 330 Q