http+socket发送短信

public  function Post($data, $target) {
    $url_info = parse_url($target);
    $httpheader = "POST " . $url_info['path'] . " HTTP/1.0\r\n";
    $httpheader .= "Host:" . $url_info['host'] . "\r\n";
    $httpheader .= "Content-Type:application/x-www-form-urlencoded\r\n";
    $httpheader .= "Content-Length:" . strlen($data) . "\r\n";
    $httpheader .= "Connection:close\r\n\r\n";
    //$httpheader .= "Connection:Keep-Alive\r\n\r\n";
    $httpheader .= $data;

    $fd = fsockopen($url_info['host'], 80);
    fwrite($fd, $httpheader);
    $gets = "";
    while(!feof($fd)) {
        $gets .= fread($fd, 128);
    }
    fclose($fd);
    if($gets != ''){
        $start = strpos($gets, '<?xml');
        if($start > 0) {
            $gets = substr($gets, $start);
        }
    }
    return $gets;
}