Inserting value when there is no value in second arraylist - php

Question

I've got a problem which takes up a lot of time. While it's supposed to be really easy (because it's just so simple!).
My problem:
I have these values inside two arraylists:
$row[0]->COUNTER1 20 10 15
$row[0]->GRADE_POINTS 0 3 5
I am supposed to change these arraylists into this example:
$row[0]->COUNTER1 20 0 0 10 0 15
$row[0]->GRADE_POINTS 0 1 2 3 4 5
So the missing values are supposed to have 0 as the counter.
While this isn't that hard to do it I'm probably over thinking it.
The code which I use to create the first set of numbers is:
$result = new SimpleXMLElement($xmlresult);
$xml = $result->children("soapenv", true)->Body->children();
$xmlBody = $xml[0];
$countPerResultaat = array();
foreach($xmlBody->query[0] as $row)
{
$countPerResultaat[] = (int) $row[0]->COUNTER1;
$xaxis[] = (string) $row[0]->GRADE_POINTS;
}
The code I though that would work is this:
for($i; $i<=10; $i++){
//foreach($xmlBody->query[0] as $row)
//{
$row = $xmlBody->query[0];
if($i==$row[0]->GRADE_POINTS){
$countPerResultaat[] = (int) $row[0]->COUNTER1;
$xaxis[] = (string) $row[0]->GRADE_POINTS;
}else{
$xaxis[] = (string) $i;
$countPerResultaat[] = (int) 0;
}
}
But the row can't be used, I really don't know how to fix this. My only solution would be to use another for-loop, which would create 100 values probably.
Thanks for helping in advance!

Answer 1

If I understand correctly and if $row[0]->COUNTER1 and $row[0]->GRADE_POINTS are arrays. You will just need to loop them and use in_array(). Consider this example:
$counter1 = array(20, 10, 15);
$grade_points = array(0, 3, 5);
$new_grade_points = range(min($grade_points), max($grade_points));
foreach($new_grade_points as $key => &$value) {
// check if its part of the missing index if not get the value,
// if its the missing index put 0
$value = (in_array($key, $grade_points)) ? array_shift($counter1) : 0;
}
$counter1 = array_values($new_grade_points); // now contains 20,0,0,10,0,15
$grade_points = array_keys($new_grade_points); // now contains 0,1,2,3,4,5
print_r($counter1);
Sample Output:
Array
(
[0] => 20
[1] => 0
[2] => 0
[3] => 10
[4] => 0
[5] => 15
)

Answer 2

I think you want to count the amount of times a grade has been given? You should just loop through as usual, and when there is no value you should/could define it as 0. After that just count how many duplicates you have in the array. That way the key of the $xaxis is the grade, and the value is the amount of times that grade has been given.
foreach($xmlBody->query[0] as $row)
{
$counter = (int) $row[0]->COUNTER1;
if(counter) $countPerResultaat[] = $counter;
else $countPerResultaat[] = 0;
}
$xaxis = array_count_values($counter);