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run code in 150+ php & hhvm versions
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<?php $x = serialize(new __PHP_Incomplete_Class()); var_dump($x); var_dump(unserialize($x)); // Did I succeed?
based on R6RvN
Output for 5.2.7 - 7.1.0
string(34) "O:22:"__PHP_Incomplete_Class":0:{}" object(__PHP_Incomplete_Class)#1 (0) { }
Output for 5.2.2 - 5.2.6
string(11) "O:0:"":0:{}" Notice: unserialize(): Error at offset 2 of 11 bytes in /in/7KpPS on line 5 bool(false)
Output for 5.2.1
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 1634492914 bytes) in /in/7KpPS on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.2.0

Process exited with code 139.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/7KpPS on line 5
Process exited with code 255.
Output for 4.3.11 - 4.4.9
Fatal error: Unknown(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition unknown of the object you are trying to operate on was loaded _before_ the session was started in /in/7KpPS on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.10
Fatal error: Unknown(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition <b>unknown</b> of the object you are trying to operate on was loaded _before_ the session was started in /in/7KpPS on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Unknown(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition <b>unknown</b> of the object you are trying to operate on was loaded _before_ the session was started in /in/7KpPS on line 3