Why is my php/mysql update not accurate? - php

Question

I have a webpage with a button on it. When the button it clicked it sends a request to a page with this code on it
$userName = "tdscott";
$url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
$divID = explode('?', $url);
$id = 0;
$id = explode('#',$divID[1])[1];
$func = $divID[2];
$find = mysqli_fetch_array(mysqli_query($con,"SELECT likes FROM status WHERE id='$id'"))['likes'];
if ($func == "addLike")
{
$promoted = $userName . "-";
mysqli_query($con, "UPDATE status SET promotedBy = CONCAT(promotedBy,'$promoted') WHERE id='$id'");
$find++;
mysqli_query($con,"UPDATE status SET likes = '$find' WHERE id='$id'");
echo $find;
}//end if addLike
elseif($func === "removeLike")
{
echo "ERROR";
}//end if removeLike
elseif ($func === "getLikes")
{
echo $find;
}//end if getLikes
mysqli_close($con);
I left of the database connection information. But for some reason when this is called it produces inaccurate results. For example... Sometimes it will put multiple instances of $promoted in the promotedBy field in my table and sometimes it will update other rows in the table that the id does not equal the current $id. I am wondering if somehow it is getting the $id variable mixed up from when I submitted it with a different value before. Is there a way to reset the variables before I call it each time?
Please note: In the if statement, we are only looking at the addLike portion. I included the other just in case it was causing the problem.

Answer 1

unset($id);
Sorry should have done more research.