Upvote / Downvote

by 

if($upvote != "")  { //i dont know where you get this value from

change this line to

if(isset($_GET['upvote'])&&$_GET['upvote']!=""){
    $upvote=$_GET['upvote'];
        //your code to update upvote
        }
       if(isset($_GET['downvote'])&&$_GET['downvote']!=""){
$downvote=$_GET['downvote];
        //here is your code to update downvote
        }

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