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<?php $str = 'O:17:"DateTimeImmutable":3:{s:4:"date";s:4:"ryat";s:13:"timezone_type";i:3;s:8:"timezone";s:3:"UTC";}'; var_dump(unserialize($str));
based on 4kh63
Output for 7.1.0
Fatal error: Uncaught Error: Invalid serialization data for DateTime object in /in/eoEEW:4 Stack trace: #0 [internal function]: DateTimeImmutable->__wakeup() #1 /in/eoEEW(4): unserialize('O:17:"DateTimeI...') #2 {main} thrown in /in/eoEEW on line 4
Process exited with code 255.
Output for 5.5.24 - 5.6.28, 7.0.0 - 7.0.14
Fatal error: Invalid serialization data for DateTime object in /in/eoEEW on line 4
Process exited with code 255.
Output for hhvm-3.12.0
object(DateTimeImmutable)#1 (4) { ["data":"DateTimeImmutable":private]=> NULL ["date"]=> string(4) "ryat" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.4.45
object(__PHP_Incomplete_Class)#1 (4) { ["__PHP_Incomplete_Class_Name"]=> string(17) "DateTimeImmutable" ["date"]=> string(4) "ryat" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }
Output for 4.3.0 - 4.4.9
object(__PHP_Incomplete_Class)(4) { ["__PHP_Incomplete_Class_Name"]=> string(17) "datetimeimmutable" ["date"]=> string(4) "ryat" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }