Bug #79203 [Com]: Inconsistent behaviour of ArrayIterator

Edit report at https://bugs.php.net/bug.php?id=79203&edit=1 ID: 79203 Comment by: mail at dabla dot ch Reported by: mail at dabla dot ch Summary: Inconsistent behaviour of ArrayIterator Status: Open Type: Bug Package: SPL related Operating System: Linux PHP Version: 7.4.2 Block user comment: N Private report: N New Comment: The test script does not do exactly the described thing. This would be more accurate: $a = new ArrayObject(['item']); $i = $a->getIterator(); for($c = 0; $c < 20; $c++) { echo ($i->valid() ? 'valid' : 'invalid') . PHP_EOL; if(!$i->valid()) { $i->rewind(); } $a->offsetUnset($i->key()); $a->append('item'); } Previous Comments: ------------------------------------------------------------------------ [2020-01-31 13:59:57] mail at dabla dot ch Description: ------------ When calling offsetUnset for the only element in an ArrayObject and then append one item, the resulting position of an associated ArrayIterator doesn't seem to be well defined. Steps to reproduce: - Create an ArrayObject with one item. - Get an ArrayIterator for the ArrayObject. - Repeat: - Call offsetUnset with the key of the one element in the array. Note: Calling offsetUnset on the array or the iterator does not change the behaviour. - Append an item to the ArrayObject. - check if the iterator is valid Until php 7.2 the iterator did always point to the appended element. Test script: --------------- <?php $a = new ArrayObject(['item']); $i = $a->getIterator(); for($c = 0; $c < 100; $c++) { echo ($i->valid() ? 'valid' : 'invalid') . PHP_EOL; if($i->valid()) { $a->offsetUnset($i->key()); } $a->append('item'); } Expected result: ---------------- The behaviour should at least be consistent. It would be best to have the same behaviour as with php7.2, meaning the test script would always output "valid". Actual result: -------------- The behaviour is inconsistent. The test script outputs: valid valid valid valid valid valid valid valid invalid invalid invalid invalid invalid invalid invalid invalid valid invalid valid invalid ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79203&edit=1