Headers.php
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	<?php

	namespace Httpful\Response;

	final class Headers implements \ArrayAccess, \Countable {

	private $headers;

	private function __construct($headers)
	{
	$this->headers = $headers;
	}

	public static function fromString($string)
	{
	$lines = preg_split("/(\r\|\n)+/", $string, -1, PREG_SPLIT_NO_EMPTY);
	array_shift($lines); // HTTP HEADER
	$headers = array();
	foreach ($lines as $line) {
	list($name, $value) = explode(':', $line, 2);
	$headers[strtolower(trim($name))] = trim($value);
	}
	return new self($headers);
	}

	public function offsetExists($offset)
	{
	return isset($this->headers[strtolower($offset)]);
	}

	public function offsetGet($offset)
	{
	if (isset($this->headers[$name = strtolower($offset)])) {
	return $this->headers[$name];
	}
	}

	public function offsetSet($offset, $value)
	{
	throw new \Exception("Headers are read-only.");
	}

	public function offsetUnset($offset)
	{
	throw new \Exception("Headers are read-only.");
	}

	public function count()
	{
	return count($this->headers);
	}

	public function toArray()
	{
	return $this->headers;
	}

	}