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<?php class A{ function test(A $a, B $b){} } class B extends A{ function test(A $a, B $b, C $c = NULL){} } class C extends B{ function test(A $a, B $b, D $c = NULL){} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Could not check compatibility between C::test(A $a, B $b, ?D $c = null) and B::test(A $a, B $b, ?C $c = null), because class D is not available in /in/ljNjE on line 12
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Could not check compatibility between C::test(A $a, B $b, ?D $c = NULL) and B::test(A $a, B $b, ?C $c = NULL), because class D is not available in /in/ljNjE on line 12
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of C::test(A $a, B $b, ?D $c = NULL) should be compatible with B::test(A $a, B $b, ?C $c = NULL) in /in/ljNjE on line 13
Output for 7.0.0 - 7.0.20
Warning: Declaration of C::test(A $a, B $b, D $c = NULL) should be compatible with B::test(A $a, B $b, C $c = NULL) in /in/ljNjE on line 13
Output for 5.4.17 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Strict Standards: Declaration of C::test() should be compatible with B::test(A $a, B $b, C $c = NULL) in /in/ljNjE on line 13
Output for 5.4.0 - 5.4.16
Strict Standards: Declaration of C::test() should be compatible with A::test(A $a, B $b) in /in/ljNjE on line 13
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Strict Standards: Declaration of C::test() should be compatible with that of B::test() in /in/ljNjE on line 13
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/ljNjE on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/ljNjE on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/ljNjE on line 4
Process exited with code 255.

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