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<?php class Bar {} class Foo extends Bar {} $foo = new Foo(); var_dump(is_sublcass_of($foo, 'Bar'));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function is_sublcass_of() in /in/Wvi6g:9 Stack trace: #0 {main} thrown in /in/Wvi6g on line 9
Process exited with code 255.

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