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<?php interface MyInterface { } class BaseClass implements MyInterface{ } class MyClass extends BaseClass{ } $object = new MyClass(); echo @is_subclass_of('BaseClass', 'BaseClass')? "Yes ":"No "; echo @is_subclass_of('MyClass', 'BaseClass')? "Yes ":"No "; echo @is_subclass_of('MyClass', 'MyInterface')? "Yes ":"No "; echo "\n"; echo @is_subclass_of($object, 'BaseClass')? "Yes\n":"No\n"; echo @is_subclass_of($object, 'MyInterface')? "Yes\n":"No\n";
Output for 5.0.3 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
No Yes Yes Yes Yes
Output for 5.0.0 - 5.0.2
No No No Yes Yes
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/GJiMT on line 2
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/GJiMT on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/GJiMT on line 2
Process exited with code 255.

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