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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));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Invalid serialization data for DateTimeImmutable object in /in/eoEEW:4 Stack trace: #0 [internal function]: DateTimeImmutable->__unserialize(Array) #1 /in/eoEEW(4): unserialize('O:17:"DateTimeI...') #2 {main} thrown in /in/eoEEW on line 4
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught Error: Invalid serialization data for DateTimeImmutable 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 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
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 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Fatal error: Invalid serialization data for DateTime object in /in/eoEEW on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 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 - 4.3.11, 4.4.0 - 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" }

preferences:
281.21 ms | 402 KiB | 460 Q