Description:
------------
Seen at http://stackoverflow.com/questions/2899274/

If you use simplexml_load_file() to load a remote document via HTTP, SimpleXML assumes that the content is UTF-8 regardless of the HTTP headers. In the test script below, at the time of writing, Google's web server returns something like:

-------------
HTTP/1.1 200 OK
Content-Type: text/xml; charset=GB2312
Date: Tue, 25 May 2010 05:05:17 GMT
Pragma: no-cache
Expires: Fri, 01 Jan 1990 00:00:00 GMT
Cache-Control: no-cache, no-store, must-revalidate
expires=Thu, 24-May-2012 05:05:17 GMT; path=/; domain=.google.com
X-Content-Type-Options: nosniff
Server: igfe
X-XSS-Protection: 1; mode=block
Transfer-Encoding: chunked

<?xml version="1.0"?><xml_api_reply version="1">
<!-- single-byte encoded GB2312 stuff -->
</xml_api_reply>
-------------

The server advertises the content "text/xml; charset=GB2312", but since the XML declaration doesn't mention the encoding, SimpleXML assumes it is UTF-8 and eventually fails to load it.

If it is at all possible, SimpleXML (and DOM, I assume) should look at the HTTP headers to find the document's encoding.

Test script:
---------------
simplexml_load_file('http://www.google.com/ig/api?weather=11791&hl=zh-CN');

Actual result:
--------------
PHP Warning:  simplexml_load_file(): http://www.google.com/ig/api?weather=11791&hl=zh-CN:1: parser error : Input is not proper UTF-8, indicate encoding !
Bytes: 0xC7 0xE7 0x22 0x2F in Command line code on line 1

Warning: simplexml_load_file(): http://www.google.com/ig/api?weather=11791&hl=zh-CN:1: parser error : Input is not proper UTF-8, indicate encoding !
Bytes: 0xC7 0xE7 0x22 0x2F in Command line code on line 1
PHP Warning:  simplexml_load_file(): t_system data="SI"/></forecast_information><current_conditions><condition data=" in Command line code on line 1

Warning: simplexml_load_file(): t_system data="SI"/></forecast_information><current_conditions><condition data=" in Command line code on line 1
PHP Warning:  simplexml_load_file():                                                                                ^ in Command line code on line 1

Warning: simplexml_load_file():