ChunkedIterator.php

<?php
 
namespace Guzzle\Iterator;
 
class ChunkedIterator extends \IteratorIterator
{
    protected $chunkSize;
 
    protected $chunk;
 
    public function __construct(\Traversable $iterator, $chunkSize)
    {
        $chunkSize = (int) $chunkSize;
        if ($chunkSize < 0 ) {
            throw new \InvalidArgumentException("The chunk size must be equal or greater than zero; $chunkSize given");
        }
 
        parent::__construct($iterator);
        $this->chunkSize = $chunkSize;
    }
 
    public function rewind()
    {
        parent::rewind();
        $this->next();
    }
 
    public function next()
    {
        $this->chunk = array();
        for ($i = 0; $i < $this->chunkSize && parent::valid(); $i++) {
            $this->chunk[] = parent::current();
            parent::next();
        }
    }
 
    public function current()
    {
        return $this->chunk;
    }
 
    public function valid()
    {
        return (bool) $this->chunk;
    }
}