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run code in 150+ php & hhvm versions
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<?php class IteratorTest extends ArrayIterator{} $something = new StdClass(); $i = new IteratorTest(); $i[] = $something; var_dump($i);
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
object(IteratorTest)#2 (1) { ["storage":"ArrayIterator":private]=> array(1) { [0]=> object(stdClass)#1 (0) { } } }
Output for hhvm-3.12.0
object(IteratorTest)#2 (2) { ["storage":"ArrayIterator":private]=> array(1) { [0]=> object(stdClass)#1 (0) { } } ["flags":"ArrayIterator":private]=> int(0) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
object(IteratorTest)#2 (1) { [0]=> object(stdClass)#1 (0) { } }
Output for 4.3.2 - 4.4.9
Fatal error: Class iteratortest: Cannot inherit from undefined class arrayiterator in /in/WQfuC on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Class iteratortest: Cannot inherit from undefined class arrayiterator in /in/WQfuC on line 3