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<?php class Checker { public function check(): void {} } class A { public function checkThings() { $check1 = new Checker; $check1->check(); } } $a = new A(); $a->checkThings(); class B { public function checkThings(Checker $checker) { $checker->check(); } } $checker = new Checker(); $b = new B(); $b->checkThings( $checker );
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