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<?php class Foo { public function bar(self $baz) { } } var_dump((new ReflectionParameter([Foo::class, 'bar'], 'baz'))->getClass());
based on OKP77
Output for 5.5.24 - 5.6.21, 7.0.0 - 7.1.0
object(ReflectionClass)#2 (1) { ["name"]=> string(3) "Foo" }
Output for hhvm-3.12.0
object(ReflectionClass)#3 (2) { ["name"]=> string(3) "Foo" ["obj":"ReflectionClass":private]=> NULL }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/S82UR on line 6
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/S82UR on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/S82UR on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/S82UR 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, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/S82UR on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/S82UR on line 3
Process exited with code 255.