IteratorIterator::getInnerIterator()
(PHP 5>=5.1.0,PHP 7)
Get the inner iterator
说明
public IteratorIterator::getInnerIterator(void) :Traversable
Get the inner iterator.
参数
此函数没有参数。
返回值
The inner iterator as passed toIteratorIterator::__construct().
参见
- Iterator
- OuterIterator
The returned value from getInnerIterator() really is the inner iterator, not a clone. It should be used with respect: calling next() or rewind() on it, for example, will advance or reset the inner iterator - although the effect won't be noticed until you call next() on the IteratorIterator object - it seems as if it caches its current() and key() values (as of PHP v5.5.9). Even if the inner iterator itself is valid (i.e. valid() returns TRUE) the IteratorIterator won't report itself as valid until you either rewind it or call its next() method - these two methods cause the IteratorIterator to re-sync its current, key and valid states with the inner iterator. <?php $ii = new IteratorIterator(new ArrayIterator(range(1,6))); $i1 = $ii->getInnerIterator(); // gets the real thing $i2 = $ii->getInnerIterator(); // ditto: $i2 === $i1 and the two are therefore in sync. echo $i1->current(); // 1 echo $i1->key(); // 0 var_dump($ii->valid()); // FALSE $i1->next(); // affects $i2, which is identical echo $i1->key(); // 1 var_dump($ii->valid()); // still FALSE $ii->rewind(); // rewinds $i1 and synchronizes echo $ii->key(); // 0, as is $i1->key() $i1->next(); // advances the inner iterator, which is now out of sync echo $ii->key(); // still 0 echo $i1->key(); // 1 $ii->next(); // advances the inner iterator and syncs with it echo $ii->key(); // 2 echo $i1->key(); // 2 ?>