PHP模拟异步提交

//$url 异步地址
//$data 请求数据
function Fsockopen_Post($url, $data = '')
{
    $row = parse_MyUrl($url);
    $host = $row['host'];
    $port = isset($row['port']) ? $row['port'] : 80;
    $file = $row['path'];
    $post = '';
    while (list($k,$v) = each($data)) 
    {
        if(isset($k) && isset($v)) $post .= rawurlencode($k)."=".rawurlencode($v)."&"; //转URL标准码
    }
    $post = substr( $post , 0 , -1 );
    $len = strlen($post);
    $fp = @fsockopen( $host ,$port, $errno, $errstr, 10);
    if (!$fp) {
        return "$errstr ($errno)\n";
    } else {
        $receive = '';
        $out = "POST $file HTTP/1.0\r\n";
        $out .= "Host: $host\r\n";
        $out .= "Content-type: application/x-www-form-urlencoded\r\n";
        $out .= "Connection: Close\r\n";
        $out .= "Content-Length: $len\r\n\r\n";
        $out .= $post;    
        fwrite($fp, $out);
        while (!feof($fp)) {
          $receive .= fgets($fp, 128);
        }
        fclose($fp);
        $receive = explode("\r\n\r\n",$receive);
        unset($receive[0]);
        return implode("",$receive);
    }
}