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<?php $class = 'PDO'; var_dump(unserialize(sprintf( 'O:%d:"%s":0:{}', strlen($class), $class )));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught Exception: Unserialization of 'PDO' is not allowed in /in/6Sgjt:4 Stack trace: #0 /in/6Sgjt(4): unserialize('O:3:"PDO":0:{}') #1 {main} thrown in /in/6Sgjt on line 4
Process exited with code 255.
Output for 8.1.0 - 8.1.28
Fatal error: Uncaught Exception: Unserialization of 'PDO' is not allowed in /in/6Sgjt:7 Stack trace: #0 /in/6Sgjt(7): unserialize('O:3:"PDO":0:{}') #1 {main} thrown in /in/6Sgjt on line 7
Process exited with code 255.
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Warning: Erroneous data format for unserializing 'PDO' in /in/6Sgjt on line 7 Notice: unserialize(): Error at offset 13 of 14 bytes in /in/6Sgjt on line 7 bool(false)
Output for 7.0.19 - 7.0.20, 7.1.5 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33
Fatal error: Uncaught PDOException: You cannot serialize or unserialize PDO instances in /in/6Sgjt:7 Stack trace: #0 [internal function]: PDO->__wakeup() #1 /in/6Sgjt(7): unserialize('O:3:"PDO":0:{}') #2 {main} thrown in /in/6Sgjt on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.18, 7.1.0 - 7.1.4
Fatal error: Uncaught PDOException: You cannot serialize or unserialize PDO instances in /in/6Sgjt:6 Stack trace: #0 [internal function]: PDO->__wakeup() #1 /in/6Sgjt(6): unserialize('O:3:"PDO":0:{}') #2 {main} thrown in /in/6Sgjt on line 6
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30
Fatal error: Uncaught exception 'PDOException' with message 'You cannot serialize or unserialize PDO instances' in /in/6Sgjt:8 Stack trace: #0 [internal function]: PDO->__wakeup() #1 /in/6Sgjt(8): unserialize('O:3:"PDO":0:{}') #2 {main} thrown in /in/6Sgjt on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5
object(__PHP_Incomplete_Class)#1 (1) { ["__PHP_Incomplete_Class_Name"]=> string(3) "PDO" }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(__PHP_Incomplete_Class)(1) { ["__PHP_Incomplete_Class_Name"]=> string(3) "pdo" }

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