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<?php class Test implements Serializable { public $member, $message; function __construct($message) { $this->message = $message; } function serialize() { return serialize(array($this->message, $this->member)); } function unserialize($serialized) { list($this->message, $this->member) = unserialize($serialized); } } $constructed = new Test("original"); $constructed->member = $constructed; //References to self (in this example pointless, but technically legal) var_dump($constructed); $transported = unserialize(serialize($constructed)); // Segmentation fault.
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Test implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/t2m1F on line 2 object(Test)#1 (2) { ["member"]=> *RECURSION* ["message"]=> string(8) "original" }

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