PHP输出XML文件函数
function xml_out($content, $charset = 'utf-8') {
@header("Expires: -1");
@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
@header("Pragma: no-cache");
@header("Content-type: application/xml; charset=$charset");
echo '<' . "?xml version=\"1.0\" encoding=\"$charset\"?>\n";
echo "<root><![CDATA[" . trim($content) . "]]></root>";
exit();
}