3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface B { } interface A extends B { public function a(B $a); } class AA implements A { public function a(A $a) { // } }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Declaration of AA::a(A $a) must be compatible with A::a(B $a) in /in/0o7gn on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Declaration of AA::a(A $a) must be compatible with A::a(B $a) in /in/0o7gn on line 12
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Declaration of AA::a() must be compatible with A::a(B $a) in /in/0o7gn on line 13
Process exited with code 255.

preferences:
222.32 ms | 401 KiB | 179 Q