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<?php var_dump(unserialize('C:19:"SplDoublyLinkedList":0:{}'));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(0) { } }
Output for 5.4.14 - 5.4.45, 5.5.0 - 5.5.38
Fatal error: Uncaught exception 'UnexpectedValueException' with message 'Serialized string cannot be empty' in /in/OBkjY:3 Stack trace: #0 [internal function]: SplDoublyLinkedList->unserialize('') #1 /in/OBkjY(3): unserialize('C:19:"SplDoubly...') #2 {main} thrown in /in/OBkjY on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.13
Notice: unserialize(): Error at offset 30 of 31 bytes in /in/OBkjY on line 3 Fatal error: Uncaught exception 'UnexpectedValueException' with message 'Serialized string cannot be empty' in /in/OBkjY:3 Stack trace: #0 [internal function]: SplDoublyLinkedList->unserialize('') #1 /in/OBkjY(3): unserialize('C:19:"SplDoubly...') #2 {main} thrown in /in/OBkjY on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Warning: Class SplDoublyLinkedList has no unserializer in /in/OBkjY on line 3 object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(0) { } }

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