3v4l.org

run code in 300+ PHP versions simultaneously
<?php trait X{ abstract function test(B $b); } interface LOLI{ function test(A $a); } class LOL implements LOLI{ use X; function test(A $a){} }
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: Could not check compatibility between LOL::test(A $a) and X::test(B $b), because class B is not available in /in/Skfka on line 13
Process exited with code 255.
Output for 5.4.7 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
preferences:
52.54 ms | 408 KiB | 5 Q