callable = $callable;
if (!is_callable($callable)) {
throw new \InvalidArgumentException('the second argument must be callable');
}
if (is_array($data)) {
$ao = new \ArrayObject($data);
$this->data = $ao->getIterator();
} elseif ($data instanceof Iterator) {
$this->data = $data;
} elseif ($data instanceof IteratorAggregate) {
$this->data = $data->getIterator();
} else {
throw new \InvalidArgumentException('data must be an array or an Iterator/IteratorAggregate');
}
}
/**
* (PHP 5 >= 5.0.0)
* Return the current element
* @link http://php.net/manual/en/iterator.current.php
* @return mixed Can return any type.
*/
public function current()
{
return call_user_func($this->callable, $this->data->current());
}
/**
* (PHP 5 >= 5.0.0)
* Move forward to next element
* @link http://php.net/manual/en/iterator.next.php
* @return void Any returned value is ignored.
*/
public function next()
{
$this->data->next();
}
/**
* (PHP 5 >= 5.0.0)
* Return the key of the current element
* @link http://php.net/manual/en/iterator.key.php
* @return mixed scalar on success, or null on failure.
*/
public function key()
{
return $this->data->key();
}
/**
* (PHP 5 >= 5.0.0)
* Checks if current position is valid
* @link http://php.net/manual/en/iterator.valid.php
* @return boolean The return value will be casted to boolean and then evaluated.
* Returns true on success or false on failure.
*/
public function valid()
{
return $this->data->valid();
}
/**
* (PHP 5 >= 5.0.0)
* Rewind the Iterator to the first element
* @link http://php.net/manual/en/iterator.rewind.php
* @return void Any returned value is ignored.
*/
public function rewind()
{
$this->data->rewind();
}
}