php获取bing每日一图

<?php

$xmlfile = 'https://cn.bing.com/HPImageArchive.aspx?idx=0&n=1';
$xmlparser = xml_parser_create();


$fp = fopen($xmlfile, 'r');
$xmldata = fread($fp, 4096);

xml_parse_into_struct($xmlparser,$xmldata,$values);
xml_parser_free($xmlparser);

header("Content-Type: image/jpeg"); 
echo file_get_contents('https://cn.bing.com'.$values[5][value]);

?>