<?php class A { public function &getA() { return $this->a; } } $A = new A(); $A->a = array(1); $x = $A->getA(); $clone = clone $A; $clone->a = array(); print_r($A);
<?php class A { public function getA() { return $this; } public function test() { var_dump('test'); } } class B { public function getA() { } public function test() { } } $obj = new A(); $obj->getA()->test();