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<?php function machine_forget(&$data) { $data = null; } $answer = 42; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // shhh no spoilers class zombie { private $val; public function __construct($val) { $this->val = $val; } public function __destruct() { $this->vessel = $this; } public function __toString() { return $this->val; } } $answer = new zombie("42"); $answer->vessel = &$answer; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer);
Output for git.master, git.master_jit, rfc.property-hooks
string(2) "42" string(0) "" Deprecated: Creation of dynamic property zombie::$vessel is deprecated in /in/ja9cK on line 21 string(2) "42" string(2) "42"

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