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<?php var_dump(unserialize("O:19:\"SplDoublyLinkedList\":0:{}"));
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught UnexpectedValueException: Incomplete or ill-typed serialization data in /in/XkDQu:3 Stack trace: #0 [internal function]: SplDoublyLinkedList->__unserialize(Array) #1 /in/XkDQu(3): unserialize('O:19:"SplDoubly...') #2 {main} thrown in /in/XkDQu on line 3
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Warning: Erroneous data format for unserializing 'SplDoublyLinkedList' in /in/XkDQu on line 3 bool(false)
Output for 5.4.29, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31
Warning: Erroneous data format for unserializing 'SplDoublyLinkedList' in /in/XkDQu on line 3 Notice: unserialize(): Error at offset 30 of 31 bytes in /in/XkDQu on line 3 bool(false)
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.28, 5.4.30 - 5.4.45, 5.5.24 - 5.5.35
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(0) { } }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
object(__PHP_Incomplete_Class)#1 (1) { ["__PHP_Incomplete_Class_Name"]=> string(19) "SplDoublyLinkedList" }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(__PHP_Incomplete_Class)(1) { ["__PHP_Incomplete_Class_Name"]=> string(19) "spldoublylinkedlist" }

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