Update numbers in table with variable and update variable - php

Question

As you can see from the table below the user with the id of 1 has 10 points altogether
What I'm trying to do is have one number submitted from a form $edit_points to loop through and subtract from user 1
This number could be anything eg:
$edit_points = 6
would subtract 4 from the first record
then move to the next and only subtract the remainder 2
then break out of loop
UserID | TotalPoints
-------------------
1 | 4
1 | 4
1 | 2
4 | 3
3 | 3
5 | 4
This is what I've got so far
$pointLeft = $edit_points;//sent from form
while($point = mysqli_fetch_array($output)){
if($pointLeft > $point["TotalPoints"]){//if pointsLeft more than this record
$remainder = $pointLeft-$point["TotalPoints"];//get remainder
$query2 = "UPDATE pointstable SET TotalPoints=0 WHERE UserID=".$UserID;
$output2 = $mysqli->query($query2);
}elseif($pointLeft < $point["TotalPoints"]){
$remainder = $point["TotalPoints"] - $pointLeft;
$query2 = "UPDATE pointstable SET TotalPoints=".$remainder." WHERE UserID=".$UserID;
$output2 = $mysqli->query($query2);
}
$pointLeft = $remainder;
}
It works to a point and seems to populate all the records with the same last value that remainder holds
I've tried break and putting an if ($pointLeft<=0) above the first if
but none works.
any help? or a better way of doing it preferably using php

Answer 1

Thanks to Marty
Revised code below
There's a unique id PointID that I now use
$poinstLeft = $edit_points; //sent from form
while($point = mysqli_fetch_array($output)){
//if pointsLeft more than this record
if($poinstLeft >= $point["TotalPoints"]){
//get remainder
echo $poinstLeft." ";
$remainder = $poinstLeft-$point["TotalPoints"];
$query2 = "UPDATE pointstable SET TotalPoints=0 WHERE UserID=".$UserID." AND PointID=".$point["PointID"];
$output2 = $mysqli->query($query2);
// Calculate new pointsleft
$poinstLeft = $remainder;
} elseif ($poinstLeft < $point["TotalPoints"]){
$remainder = $point["TotalPoints"] - $poinstLeft;
echo $poinstLeft." ";
$query2 = "UPDATE pointstable SET TotalPoints=".$remainder." WHERE UserID=".$UserID." AND PointID=".$point["PointID"] ;
$output2 = $mysqli->query($query2);
// Here, your remainder is different from the upper half of your if-function!
// So, you don't have to recalculate pointsleft... It's just:
$poinstLeft = 0;
// Break the while loop:
break 2;
}
}