<?php
namespace Guzzle\Iterator;
use Guzzle\Common\Exception\InvalidArgumentException;
/**
* Filters values using a callback
*
* Used when PHP 5.4's {@see \CallbackFilterIterator} is not available
*/
class FilterIterator extends \FilterIterator
{
/** @var mixed Callback used for filtering */
protected $callback;
/**
* @param \Iterator $iterator Traversable iterator
* @param array|\Closure $callback Callback used for filtering. Return true to keep or false to filter.
*
* @throws InvalidArgumentException if the callback if not callable
*/
public function __construct(\Iterator $iterator, $callback)
{
parent::__construct($iterator);
if (!is_callable($callback)) {
throw new InvalidArgumentException('The callback must be callable');
}
$this->callback = $callback;
}
public function accept()
{
return call_user_func($this->callback, $this->current());
}
}