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<?php class Foo { public $obj; } class Zoo { public $obj; public function show() { var_dump($this->obj); } } class Bar {} class Baz {} $foo = new Foo(); $zoo = new Zoo(); $a = new Bar(); $b = new Baz(); $zoo->obj = &$foo->obj; $zoo->show(); $foo->obj = $a; $zoo->show(); $foo->obj = $b; $zoo->show();
Output for git.master, git.master_jit, rfc.property-hooks
NULL object(Bar)#3 (0) { } object(Baz)#4 (0) { }

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