On 12/20/2012 04:05 PM, David Muir wrote:
The curiosity (bug?) is the need to call rewind(): $replacements_iterator = new InfiniteIterator(new ArrayIterator($replacements)); $replacements_iterator->rewind(); // why is the rewind needed? $result = preg_replace_callback( '/word/', function($matches) use ($replacements_iterator) { $r = $replacements_iterator->current(); $replacements_iterator->next(); return $r; }, 'word word word word word word word word' ); In other (simple) scripts using InfiniteIterator the rewind wasn't needed.What happens if you do: $replacements_iterator = new InfiniteIterator(new ArrayIterator($replacements)); var_dump($replacements_iterator->current()); If I remember correctly, when you pass a traversable into foreach, under the hood, it basically calls: $iterator->rewind(); while($iterator->valid()){ $value = $iterator->current(); ....(foreach block).... $iterator->next(); } So that might explain why it works in "(simple) scripts". It does seem like a bug that the rewind is required though. A newly created iterator should already be in a rewound state so the call shouldn't be needed. Cheers, David
I logged a bug so this can be tracked and re-discovered: https://bugs.php.net/bug.php?id=63823 Chris -- christopher.jo...@oracle.com http://twitter.com/ghrd Newly updated, free PHP & Oracle book: http://www.oracle.com/technetwork/topics/php/underground-php-oracle-manual-098250.html -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
