Description:
------------
While cookie parsing PHP violate RFC standards and change valid character + "plus" x2B into invalid character space x20

How to check 
1. Set cookie by php function setrawcookie(***)
2. Make sure it set correctly in browser
3. Make request with cookie and check that $_COOKIE[ COOKIE_NAME ] have cookie which plus sign was changed into space.

Valid characters for value       defined in RFC6265.4.1.1
Valid characters for name(token) defined in RFC6265.4.1.1. -> RFC2616.2.2

http://www.faqs.org/rfcs/rfc6265.html
http://www.faqs.org/rfcs/rfc2616.html

This applicable only for a value, because PHP documentation put restriction to use letters and numbers only for a cookie name.
I haven't found any restriction on value and believe value should use character defined by RFC.

Test script:
---------------
<?php

/* Run twice 
 * At first time to set the cookie.
 * At second time to validate the cookie value and check an error message.
 */
$cookieName  = 'RFC6265';
$cookieValue = '#$%&\'()*+-./0123456789<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~!';

if(empty($_COOKIE[ $cookieName ]))// Set cookie for first time.
{
  setrawcookie($cookieName, $cookieValue);
}
else// Compare received cookie value with set value. Should be same. Echo on error.
{
  for($i = strlen($cookieValue)-1; $i > -1; --$i)
  {
    if(!isset($_COOKIE[ $cookieName ][ $i ]))
        {echo "\n<br>Cookie value symbol is lost:".     $cookieValue[ $i ];}
    elseif($cookieValue[ $i ] != $_COOKIE[ $cookieName ][ $i ] )
        {echo "\n<br>Cookie value symbol is different:".$cookieValue[ $i ];}
  }
}

Expected result:
----------------
Empty output. No error message on success execution.   

Actual result:
--------------
If error happened message will showed with wrong or lost characters.