3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A; class B; class A { B b; } class B { A a; }
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.17
Parse error: syntax error, unexpected ';', expecting '{' in /in/6gRVh on line 3
Process exited with code 255.
preferences:
179.78 ms | 1395 KiB | 53 Q