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<?php $class = 'FilterIterator'; var_dump(unserialize(sprintf( 'O:%d:"%s":0:{}', strlen($class), $class )));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Cannot instantiate abstract class FilterIterator in /in/4pCJE:4 Stack trace: #0 /in/4pCJE(4): unserialize('O:14:"FilterIte...') #1 {main} thrown in /in/4pCJE on line 4
Process exited with code 255.
Output for 7.0.20, 7.1.5 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught Error: Cannot instantiate abstract class FilterIterator in /in/4pCJE:7 Stack trace: #0 /in/4pCJE(7): unserialize('O:14:"FilterIte...') #1 {main} thrown in /in/4pCJE on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.14, 7.1.0
Fatal error: Uncaught Error: Cannot instantiate abstract class FilterIterator in /in/4pCJE:6 Stack trace: #0 /in/4pCJE(6): unserialize('O:14:"FilterIte...') #1 {main} thrown in /in/4pCJE on line 6
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Cannot instantiate abstract class FilterIterator in /in/4pCJE on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(__PHP_Incomplete_Class)(1) { ["__PHP_Incomplete_Class_Name"]=> string(14) "filteriterator" }

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