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<?php interface A { function m(B $s): self; } class B implements A { function m(self $s): parent { return $this; } } class C extends B { function m(parent $s): A { return $this; } } $c = new C(); $r = $c->m($c); var_dump($r instanceof C);
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: Cannot use "parent" when current class scope has no parent in /in/Od72V on line 8
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Deprecated: Cannot use "parent" when current class scope has no parent in /in/Od72V on line 8 Fatal error: Could not check compatibility between B::m(B $s): parent and A::m(B $s): A, because class parent is not available in /in/Od72V on line 8
Process exited with code 255.
Output for 7.2.19 - 7.2.33, 7.3.6 - 7.3.33
Fatal error: Declaration of B::m(B $s): parent must be compatible with A::m(B $s): A in /in/Od72V on line 7
Process exited with code 255.
Output for 7.2.0 - 7.2.18, 7.3.0 - 7.3.5
Fatal error: Declaration of C::m(B $s): A must be compatible with B::m(B $s): parent in /in/Od72V on line 13
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Fatal error: Declaration of C::m(B $s): A must be compatible with A::m(B $s): A in /in/Od72V on line 13
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/Od72V on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':', expecting '{' or ';' in /in/Od72V on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/Od72V on line 3
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 in /in/Od72V on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Od72V on line 3
Process exited with code 255.

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