Reduce a Value from Each Iteration of Foreach in PHP - php

Question

I am trying to redeem a value from the array. For example I have 20 Points and I am going to redeem from the list of earned points.
Here is my array structure which will shown as follows
$newstructure = array(
array('earnedpoints'=>'10','usedpoints'=>'0'),
array('earnedpoints'=>'25','usedpoints'=>'0'),
);
which has n number of data's(array).
I am trying to reduce the values from the earned points
Points to redeem : 20. In a foreach statement i am just
$remainingpoints=20; // Redeeming Points is named as in variable of $remainingpoints
foreach ($newstructure as $keys => $newone) {
if ($remainingpoints > $newone['earnedpoint']) {
$remainingpoints = $remainingpoints - $newone['earnedpoint'];
} else {
$remainingpoints = $newone['earnedpoint'] - $remainingpoints;
}
}
For the Point Redeeming for the first iteration of foreach earned point is 10, remaining point is 10 (based on above code) and used point is 10
For the second iteration the earned point is 25 but i want to redeem only 10 so i want to stop the loop once the redeeming values are finished (Previous Iteration 10 and Current Iteration 10)
I trying to get the result as (Redeem Point 20)
First Iteration Used Points 10 and Remaining Points is 10.
Second Iteration Used Points 10 and Remaining Points is 0.
Also I am trying to store the information as in the form of array too.
$newstructure = array(
array('earnedpoints'=>'10','usedpoints'=>'10','remainingpoints'=>'10'),
array('earnedpoints'=>'25','usedpoints'=>'10','remainingpoints'=>'0'),
);
Can anyone point me a right direction inorder to get this desired result?

Answer 1

First thing, in one place you use earnedpoints as your table key, and in loop you use earnedpoint.
This code should work for you:
<?php
$newstructure = array(
array('earnedpoints'=>'10','usedpoints'=>'0'),
array('earnedpoints'=>'25','usedpoints'=>'0'),
);
$remainingpoints=25; // Redeeming Points is named as in variable of $remainingpoints
foreach ($newstructure as $keys => $newone) {
if ($remainingpoints > $newone['earnedpoints']) {
$toRedeem = $newone['earnedpoints'];
}
else {
$toRedeem = $remainingpoints;
}
$remainingpoints -= $toRedeem;
$newstructure[$keys]['usedpoints'] = $toRedeem;
$newstructure[$keys]['remainingpoints'] = $remainingpoints;
/*
if ( $remainingpoints == 0 ) {
break;
}
*/
}
var_dump($newstructure);
In comment I put code where you could break your loop but when you break it, you won't have set used_points and remainingpoints for the following array values