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<?php interface Test { public function selfRef(self $other); } class TestImpl implements Test { public function selfRef(Test $other) { echo var_export($other, true) . PHP_EOL; } } $a = new TestImpl(); $b = new TestImpl(); $a->selfRef($b);
Output for 5.4.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
TestImpl::__set_state(array( ))
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0
Fatal error: Declaration of TestImpl::selfRef() must be compatible with Test::selfRef(self $other) in /in/Hb0Ye on line 10
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Fatal error: Declaration of TestImpl::selfRef() must be compatible with that of Test::selfRef() in /in/Hb0Ye on line 10
Process exited with code 255.
Output for 5.0.0 - 5.2.17
Fatal error: Declaration of TestImpl::selfRef() must be compatible with that of Test::selfRef() in /in/Hb0Ye on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/Hb0Ye on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/Hb0Ye on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Hb0Ye on line 3
Process exited with code 255.