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<?php interface Thing { function foo(); function bar(); } class Foo implements Thing { function foo() {} function bar() {} } interface Thing1 { function foo(); } interface Thing2 extends Thing1 { function bar(); } class Foo1 implements Thing1 { function foo() {} } class Foo2 implements Thing2 { protected $foo1; function foo() { $this->foo1->foo(); } function bar() {} }
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