PhutilChunkedIterator.php
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	<?php

	/**
	* This is an iterator version of `array_chunk()`.
	*/
	final class PhutilChunkedIterator extends Phobject implements Iterator {

	private $iterator;
	private $size;

	private $key = 0;
	private $current;

	/**
	* @param Iterator
	* @param int
	*/
	public function __construct(Iterator $iterator, $size) {
	$this->iterator = $iterator;
	$this->size = $size;
	}

	public function rewind() {
	$this->iterator->rewind();
	$this->next();
	$this->key = 0;
	}

	/**
	* @return int
	*/
	public function key() {
	return $this->key;
	}

	/**
	* @return array
	*/
	public function current() {
	return $this->current;
	}

	public function next() {
	$this->current = array();
	while ($this->iterator->valid()) {
	$key = $this->iterator->key();
	$this->current[$key] = $this->iterator->current();
	$this->iterator->next();
	if (count($this->current) >= $this->size) {
	break;
	}
	}
	$this->key++;
	}

	public function valid() {
	return (bool)$this->current;
	}

	}