How to remove a row from result_array() with CodeIgniter

Question

Background

I am creating a ranking system which retrieves a bunch of records to compare their grades, put it on rank and delete that record for the next comparison. However, I'm having trouble on how to delete the record I tried unset() but it does not seems to work either.

Question

This the code that I'm using. Please take note that this is just pseudo-code of what we are doing and is not the actual code just to avoid confusions from the question. Take a look at this code:

// Retrive all the student records with grades.
$students = $this->grades->RetrieveRecords();

// Occupy slot.
$iterator=0;
$highest_index =0 ;
for($i=0;$i<5;$i++){

    // Search student for rank $i.

    foreach($students as $student)
    {
        // Some comparisons

        // consider we found the highest yet.
        if($highest<$student['grade']){

            // Store which index it is, because it will be deleted
            // on the next cycle if this $student['grade'] is indeed the highest on this cycle.
            $highest_index = $iterator;
        }
        $iterator+=1;
    }   

    // After getting the highest for rank $i. Delete that current record
    // from $students so on next cycle, it will be removed from the comparison.

    $unset($students[$highest_index]); // Does not work, any alternative? - Greg

    // Reset the foreach iterator for next comparison cycle.
    $iterator=0;

The $unset($students[$highest_index]); is the one we need to do the job but doesn't. We just need to delete a specific record from result_array() which is the $students. For now we ran out of alternatives and still searching across the internet/documentations. However, I'll just leave this here for some help.

We will also update this if ever we got a solution for the few hours.

At this point, I'm currently looking into changing methods upon reading Rank average with PHP. — billywafuu
– billywafuu, Commented Sep 17, 2018 at 23:31

Charles Cavalcante · Accepted Answer · 2018-09-18 00:29:17Z

1

you can use array_filter:

$students = array_filter($students, function($student) use($highest)
{
    return $student['grade'] < $highest;
});

answered Sep 18, 2018 at 0:29

Charles Cavalcante

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