Saqlain Syed - 5 months ago 43

PHP Question

I have a multidimensional array of students 'name' and 'scores':

`$student = array('Alice' => array(84, 93, 88, 100, 92, 84) ,`

'bob' => array(92, 47, 68, 79, 89) ,

'charlie' => array(73, 85, 84, 69, 67, 92) ,

'denis' => array(59, 92, 83, 79, 73) ,

'eve' => array(91, 68, 85, 79, 84));

Now, I want to find the average of highest 'five' marks of each student:

`foreach ($students as $student => $key){`

echo $student . '<br>';

arsort($key);

$value = array_slice($key, 0,5);

foreach ($value as $output){

$total += $output . '<br />';

$average = $total / count($value);

}

echo $average . '<br/>';

}

My problem is, instead of giving the average of all the students, it is giving the average of only first student 'Alice'. What should I do to get the average of all students?

Answer

If I understand the question correctly, the following code can be used to add each student's top 5 scores to an array, and then average that array.

```
$scores = array();
foreach ($students as $student => $key){
// Sort this student's scores
arsort($key);
// Add the top 5 scores to the scores array
$scores = array_merge($scores, array_slice($key, 0,5));
}
// Average of all the top 5 scores
$average = array_sum($scores) / count($scores);
```