3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php interface I { } class C implements I { } interface BI { function x(): I; } class BC implements BI { function x(): C; }
based on MT3XI
Output for 7.0.0 - 7.1.7
Fatal error: Non-abstract method BC::x() must contain body in /in/DqrqS on line 14
Process exited with code 255.
Output for hhvm-3.15.4
Fatal error: Uncaught Error: Non-abstract method BC::x() must contain body in /in/DqrqS:14 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/DqrqS on line 11
Process exited with code 255.