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1<?php
2$secret_key = "KEY"; //Set this as your secret key, to prevent others uploading to your server.
3$sharexdir = ""; //This is your file dir, also the link..
4$domain_url = 'DOMAIN.COM';
5$lengthofstring = 4; //Length of the file name
6
7function RandomString($length) {
8    $keys = array_merge(range(0,9), range('a', 'z'));
9
10    $key = '';
11    for($i=0; $i < $length; $i++) {
12        $key .= $keys[mt_rand(0, count($keys) - 1)];
13    }
14    return $key;
15}
16
17if(isset($_POST['secret']))
18{
19    if($_POST['secret'] == $secret_key)
20    {
21        $filename = RandomString($lengthofstring);
22        $target_file = $_FILES["sharex"]["name"];
23        $fileType = pathinfo($target_file, PATHINFO_EXTENSION);
24
25        if (move_uploaded_file($_FILES["sharex"]["tmp_name"], $sharexdir.$filename.'.'.$fileType))
26        {
27            echo $domain_url.$sharexdir.$filename.'.'.$fileType;
28        }
29            else
30        {
31           echo 'File upload failed - CHMOD/Folder doesn\'t exist?';
32        }
33    }
34    else
35    {
36        echo 'Invalid Secret Key';
37    }
38}
39else
40{
41    echo 'No post data recieved';
42}
43?>