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<?php interface Comparable { public function compare(self $compare); } // Which is then implemented: class Foo implements Comparable { public function compare(self $compare) {} } class Bar implements Comparable { public function compare(self $compare) {} } $foo = new Foo(); $bar = new Bar(); $foo->compare($foo); $bar->compare($bar);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Foo::compare(Foo $compare) must be compatible with Comparable::compare(Comparable $compare) in /in/IfV7u on line 11
Process exited with code 255.

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