Display students grades in alphabetical order - php

Question

I've been able to display the number of times each grade appears on a student's report sheet. However, they are not sorted alphabetically.
grade image
The image above shows that the student got 2Bs, 4B+, 3As, and 1E. My code displays it like this.
But I want the grades to be displayed in alphabetical order like this 3As, 2Bs, 4B+, and 1E.
How do I do that?
Here is my code
<?php $i = 1;
$total = 0;
$count = count($subjectScores);
$grades_count = [];
foreach ($subjectScores as $value) { ?>
<?php
if ($value->tot_score >= 90 && $value->tot_score <= 100) {
$grade = 'A+';
$remark = 'DISTINCTION';
} elseif ($value->tot_score >= 80 && $value->tot_score <= 89.99) {
$grade = 'A';
$remark = 'EXCELLENT';
} elseif ($value->tot_score >= 70 && $value->tot_score <= 79.99) {
$grade = 'B+';
$remark = 'VERY GOOD';
} elseif ($value->tot_score >= 60 && $value->tot_score <= 69.99) {
$grade = 'B';
$remark = 'GOOD';
} elseif ($value->tot_score >= 50 && $value->tot_score <= 59.99) {
$grade = 'C';
$remark = 'ABOVE AVERAGE';
} elseif ($value->tot_score >= 45 && $value->tot_score <= 49.99) {
$grade = 'D';
$remark = 'AVERAGE';
} elseif ($value->tot_score >= 40 && $value->tot_score <= 44.99) {
$grade = 'E';
$remark = 'FAIR';
} elseif ($value->tot_score >= 0 && $value->tot_score <= 39.99) {
$grade = 'F';
$remark = 'NEEDS SERIOUS IMPROVEMENT';
}
// declare count for grade initially with 0
if(isset($grades_count[$grade]) === false) {
$grades_count[$grade] = 0;
}
{
// increment count for given grade
$grades_count[$grade]++;
}
?>
<?php foreach ($grades_count as $grade=>$count) {
echo "$count$grade ";
} ?>