<?
class CollectionIterator implements Iterator {

   private $_collection;
   private $_currIndex = 0;
   private $_keys;

   function __construct(Collection $objCol) {
     $this->_collection = $objCol;
     $this->_keys = $this->_collection->keys();
   }

   function rewind() {
     $this->_currIndex = 0;
   }

   function hasMore() {
     return $this->_currIndex < $this->_collection->length();
   }

   function key() {
     return $this->_keys[$this->_currIndex];
   }

   function current() {
     return $this->_collection->getItem($this->_keys[$this->_currIndex]);
   }

   function next() {
     $this->_currIndex++;
   }
}
?>