IP Address Lookup in Bulk Using PHP and MySQL for IPV6

/****************************************************************************************************************/
/* Description: This snippet is provide simple way to help user on how to lookup IP address in bulk .           */
/*              suggestions for different city locations across the country.                                    */
/*              There are 1 steps in this snippet. For information, please visit IP2Location tutorial page at:  */
/* https://www.ip2location.com/tutorials/lookup-ip-address-in-bulk-using-php-and-mysql-database                 */
/****************************************************************************************************************/
/* You can obtain free IP2Location LITE database for IPv6 at https://lite.ip2location.com                       */

<?php

    // MYSQL configuration
    $mysql_server = "mysql_server.com";
    $mysql_user_name ="User ID";
    $mysql_user_pass ="password";

    // Connect to the database server
    $link = mysqli_connect($mysql_server, $mysql_user_name, $mysql_user_pass) or die("Could not connect to MySQL database");

    // Connect to the IP2Location database
    mysqli_select_db($link,"ip2location") or die("Could not select database");


    //Display for user input
    echo "<html>";
    echo "<head><title>IP Query in Bulk</title></head>";
    echo "<body>
            <span>Upload IP list for validation:</span><br/><br/>
            <form action='' method='post' enctype='multipart/form-data'>
            <input name='uploaded_file' type='file' value='' /><br>
            <input type='submit' name='submit' value='Upload & Process' />
            </form>
        </body>";
    echo "</html>";


    //File submitted
    if(isset($_POST['submit']))
    {
        //Check for file error
        if($_FILES["uploaded_file"]["error"] > 0)
        {
            echo "Error :" .$_FILES["uploaded_file"]["error"]. "<br>";
        }
        else
        {
            echo "Input File Path :" , realpath(dirname(__FILE__))  ;
            echo "<br>";
            echo "File Name : " .$_FILES["uploaded_file"]["name"]. "<br>";
            echo "Type : " .$_FILES["uploaded_file"]["type"]. "<br>";
            echo "Size : " .($_FILES["uploaded_file"]["size"]/ 1024). "KB<br>";
        }

        //Name the output file
        if(file_exists( "result.csv"))
        {
            $duplicatefile = "result.csv";
            unlink($duplicatefile);
            echo "Duplicate file deleted ! <br>";
        }

        //Check if uploaded file exists
        if(file_exists( $_FILES["uploaded_file"]["name"]))
        {
            echo"Uploaded file already exist, Please make sure that both file's content are same. <br>"   ;
        }
        else
        {
            move_uploaded_file($_FILES["uploaded_file"]["tmp_name"],
             $_FILES["uploaded_file"]["name"]);
        }

        //Open file from its location
        $file =  $_FILES["uploaded_file"]["name"];
        $ipfile = fopen($file,"r") or exit("unable to open file!");

        //To split up the IP Address and fetch data from server
        while(! feof($ipfile))
        {
            $iplist = stream_get_line($ipfile,100,",");

            $ipno = Dot2LongIPv6($iplist);
            $query = "SELECT * FROM ip2location_db11 WHERE ip_to >= $ipno order by ip_to limit 1 ";

            if(!$query)
            {
                echo "Error";
            }

            $result = mysqli_query($link,$query) or die("IP2Location Query Failed");


            while($row = mysqli_fetch_array($result,MYSQL_ASSOC))
                {
                    $current = "\"$iplist\",\"$ipno\",\"{$row['country_code']}\",\"{$row['country_name']}\",\"{$row['region_name']}\",\"{$row['city_name']}\",\"{$row['latitude']}\",\"{$row['longitude']}\",\"{$row['zip_code']}\",\"{$row['time_zone']}\"" ;

                    //Output file to the path you want
                        $ans = "result.csv";
                        $fp = fopen($ans,"a") or die("couldn't open $ans for writing");
                        fwrite($fp,$current) or die ("couldn't write values to file!");
                        fclose($fp);
                }
        }
                echo "Result File Path : ", realpath($ans);
                echo "<br>";

        // Free recordset and close database connection
        mysqli_free_result($result);
        mysqli_close($link);
    }


    // Function to convert IP address to IP number (IPv6)
        function Dot2LongIPv6 ($IPaddr) {
            $int = inet_pton($IPaddr);
            $bits = 15;
            $ipv6long = 0;
            while($bits >= 0){
                $bin = sprintf("%08b", (ord($int[$bits])));
                if($ipv6long){
                    $ipv6long = $bin . $ipv6long;
                }
                else{
                    $ipv6long = $bin;
                }
                $bits--;
            }
            $ipv6long = gmp_strval(gmp_init($ipv6long, 2), 10);
            return $ipv6long;
        }

?>