Bug #63077 [NEW]: AppendIterator sometimes iterates 2 times over first iterator

From: david at grudl dot com Operating system: PHP version: 5.4.6 Package: SPL related Bug Type: Bug Bug description:AppendIterator sometimes iterates 2 times over first iterator Description: ------------ Due to this bug I cannot use PHP AppendIterator because it gives wrong (doubled) results. It is very hard to explain it, so there is isolated use case http://davidgrudl.com/tmp/appenditerator.zip It affects all PHP versions. Test script: --------------- /* Directory structure: /one a /b c d /two */ class Filter extends FilterIterator { public function accept() { $this->x++; return $this->x > 1; } } $append = new AppendIterator(); $iterator = new RecursiveDirectoryIterator('one', RecursiveDirectoryIterator::SKIP_DOTS); $iterator = new RecursiveIteratorIterator($iterator); $iterator = new Filter($iterator); $append->append($iterator); $iterator = new RecursiveDirectoryIterator('two'); $iterator = new RecursiveIteratorIterator($iterator); $append->append($iterator); foreach($append as $file){ echo $file, "\n"; } Expected result: ---------------- Should print: one/b/c one/b/d Actual result: -------------- Prints: one/b/c one/b/d one/b/c one/b/d -- Edit bug report at https://bugs.php.net/bug.php?id=63077&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=63077&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=63077&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=63077&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=63077&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=63077&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=63077&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=63077&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=63077&r=needscript Try newer version: https://bugs.php.net/fix.php?id=63077&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=63077&r=support Expected behavior: https://bugs.php.net/fix.php?id=63077&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=63077&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=63077&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=63077&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=63077&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=63077&r=dst IIS Stability: https://bugs.php.net/fix.php?id=63077&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=63077&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=63077&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=63077&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=63077&r=mysqlcfg