Code:

<?php

$file = "../nesto.zip";                                                       // putanja do fajla
$addr_md5 = md5($_SERVER['REMOTE_ADDR']);        //md5 hash ip adrese

$sql = "SELECT COUNT(*) FROM downloads WHERE code = '{$addr_md5}'";        // provjeri da li postoji hash u bazi
$results = mysql_fetch_array(mysql_query($sql));

if($results)                                                                      // ako postoji nista od downloada
{
          print "Vec si skino fajl!";
          die();
}
else                                                                                 // ako ne postoji isporucis mu fajl i upises IP u bazu
{
        $sql = "INSERT INTO downloads ('code') VALUES ('$addr_md5')";                // dodas adresu u bazi
        mysql_query($sql);
        
        $fp = fopen($file, 'r');
        $data = fread($fp, filesize($fp));                           // strpas fajl u varijablu

         $length = strlen($imagedata);
         header('Accept-Ranges: bytes');
         header('Content-Length: '.$length);
         header('Content-Transfer-Encoding: Binary');      // oznacis ga ko binarni da ga slucajno browser ne bi pokuso prikazati
         print($data);                                                         // ouptpu
}

?>

Code:

create table downloads (
code verchar(32)
);