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<?php function takeRef(&$foo) { $foo = "this is a string now"; } class A { private array $data = [42, 23]; public function makeString() { takeRef($this->data); var_dump($this->data); } } $a = new A(); $a->makeString();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Cannot assign string to reference held by property A::$data of type array in /in/nG734:4 Stack trace: #0 /in/nG734(10): takeRef(Array) #1 /in/nG734(15): A->makeString() #2 {main} thrown in /in/nG734 on line 4
Process exited with code 255.

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