3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A{ function equals(self $other) {} } class B extends A{ function equals(self $other) {} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
Fatal error: Declaration of B::equals(B $other) must be compatible with A::equals(A $other) in /in/7hkM6 on line 8
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of B::equals(B $other) should be compatible with A::equals(A $other) in /in/7hkM6 on line 8
Output for 7.1.25 - 7.1.32, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of B::equals(B $other) should be compatible with A::equals(A $other) in /in/7hkM6 on line 9
preferences:
72.55 ms | 409 KiB | 5 Q