Doing POST Request by Socket Connection using PHP

<?php          
// submit these variables to the server
$post_data = array("test"=>"yes", "passed"=>"yes", "id"=>"3");

// send a request to specified server
$result = do_post_request("http://www.example.com/", $post_data);
if($result["status"] == "ok"){
    // headers
    echo $result["header"];
    // result of the request
    echo $result["content"];
}else{
    echo "An error occurred: ".$result["error"];
}

function do_post_request($url, $data, $referer = ""){
    // convert the data array into URL Parameters like a=1&b=2 etc.
    $data = http_build_query($data);
    // parse the given URL
    $url = parse_url($url);
   
    if($url["scheme"] != "http"){
        die("Error: only HTTP requests supported!");
    }

    // extract host and path from url
    $host = $url["host"];
    $path = $url["path"];

    // open a socket connection with port 80, set timeout 40 sec.
    $fp = fsockopen($host, 80, $errno, $errstr, 40);
    $result = "";

    if($fp){
        // send a request headers
        fputs($fp, "POST $path HTTP/1.1\r\n");
        fputs($fp, "Host: $host\r\n");
        if($referer != "") fputs($fp, "Referer: $referer\r\n");
        fputs($fp, "Content-type: application/x-www-form-urlencode
d\r\n");
        fputs($fp, "Content-length: ".strlen($data)."\r\n");
        fputs($fp, "Connection: close\r\n\r\n");
        fputs($fp, $data);
       
        // receive result from request
        while(!feof($fp)) $result .= fgets($fp, 128);
    }else{
        return array("status"=>"err", "error"=>"$errstr ($errno)");
    }

    // close socket connection
    fclose($fp);

    // split result header from the content
    $result = explode("\r\n\r\n", $result, 2);

    $header = isset($result[0]) ? $result[0] : "";
    $content = isset($result[1]) ? $result[1] : "";

    // return as structured array:
    return array(
        "status" => "ok",
        "header" => $header,
        "content" => $content
    );
}

?>