方法一，使用curl：

$xml_data = <xml>...</xml>";
$url = 'http://www.companysz.com';
$header[] = "Content-type: text/xml";//定義content-type為xml
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml_data);
$response = curl_exec($ch);
if(curl_errno($ch))
{
    print curl_error($ch);
}
curl_close($ch);

方法二，使用fsockopen：

$fp = fsockopen($server_ip, 80);
fputs($fp, "POST $path HTTP/1.0/r/n");
fputs($fp, "Host: $server/r/n");
fputs($fp, "Content-Type: text/xml/r/n");
fputs($fp, "Content-Length: $contentLength/r/n");
fputs($fp, "Connection: close/r/n");
fputs($fp, "/r/n"); // all headers sent
fputs($fp, $xml_data);
$result = '';
while (!feof($fp)) {
$result .= fgets($fp, 128);
}
return $result;