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<?php
namespace Guzzle\Iterator;
use Guzzle\Common\Exception\InvalidArgumentException;
/**
* Maps values before yielding
*/
class MapIterator extends \IteratorIterator
{
/** @var mixed Callback */
protected $callback;
/**
* @param \Traversable $iterator Traversable iterator
* @param array|\Closure $callback Callback used for iterating
*
* @throws InvalidArgumentException if the callback if not callable
*/
public function __construct(\Traversable $iterator, $callback)
{
parent::__construct($iterator);
if (!is_callable($callback)) {
throw new InvalidArgumentException('The callback must be callable');
}
$this->callback = $callback;
}
public function current()
{
return call_user_func($this->callback, parent::current());
}
}