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run code in 150+ php & hhvm versions
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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 5.4.0 - 5.6.21, 7.0.0 - 7.1.0
object(Test)#1 (2) { ["member"]=> *RECURSION* ["message"]=> string(8) "original" }
Output for hhvm-3.12.0
object(Test)#1 (2) { ["member"]=> *RECURSION* ["message"]=> string(8) "original" } Fatal error: Stack overflow in /in/t2m1F on line 10
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.14 - 5.2.17, 5.3.3 - 5.3.29
object(Test)#1 (2) { ["member"]=> *RECURSION* ["message"]=> string(8) "original" }
Process exited with code 139.
Output for 5.1.1 - 5.2.13, 5.3.0 - 5.3.2
object(Test)#1 (2) { ["member"]=> object(Test)#1 (2) { ["member"]=> *RECURSION* ["message"]=> string(8) "original" } ["message"]=> string(8) "original" }
Process exited with code 139.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/t2m1F on line 21
Process exited with code 255.
Output for 5.0.5
Fatal error: Interface 'Serializable' not found in /in/t2m1F on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Serializable' not found in /in/t2m1F on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/t2m1F on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/t2m1F on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/t2m1F on line 2
Process exited with code 255.