Bug #79203 [NEW]: Inconsistent behaviour of ArrayIterator

From: mail at dabla dot ch Operating system: Linux PHP version: 7.4.2 Package: SPL related Bug Type: Bug Bug description:Inconsistent behaviour of ArrayIterator 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 bug report at https://bugs.php.net/bug.php?id=79203&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79203&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79203&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79203&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79203&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79203&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79203&r=support Expected behavior: https://bugs.php.net/fix.php?id=79203&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79203&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79203&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79203&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79203&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79203&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79203&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79203&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79203&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79203&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79203&r=mysqlcfg