multisort for marks and gpa - php

Question

I am trying to generate a student tabulation sheet. How can I display students details with ranking according to Marks & GPA(Descending). currently I can display by either Marks or GPA with the following code:
arsort($myGpa);
foreach($myGpa as $x=>$myValue)
{
?>
<tr>
<td><?php echo $sn++; ?></td>
<td><?php echo $myName[$x]; ?></td>
<td><?php echo $myCadet[$x]; ?></td>
<td><?php echo $myTotal[$x]; ?></td>
<td><?php echo $myGrade[$x]; ?></td>
<td><?php echo number_format($myValue,2); ?> </td>
<td><?php //$position++;
$myposition = $position++;
if($myposition == '1') { echo '1st'; }
else if($myposition == '2') { echo '2nd'; }
else if($myposition == '3') { echo '3rd'; }
else echo $myposition.'th';
?> </td>
</tr>
and another thing is: if the marks & gpa are same then how to show the position ?
thanks in advance.

Answer 1

actually.. I want to sort the students according to marks & gpa. currently my output is as follows:
Total Marks - Grade - GPA - Position
813 - A - 4.50 - 1
819 - A - 4.44 - 2
779 - A - 4.31 - 3
826 - A - 4.31 - 4
but as you see 2 students got same gpa(4.31) but different marks. I want the marks to be sorted when the gpa is same. that means if 2 students have same gpa then the position will be calculated according to marks.
currently I am using the following code(sort by GPA only)
$myName[] = $student_name['name'];
$myCadet[] = $stud['cadet_no'];
$myTotal[] = $all_total;
$myGrade[] = $final_grade;
$myGpa[] = $final_gpa;
arsort($myGpa);
foreach($myGpa as $x=>$myValue)
{
?>
<tr>
<td><?php echo $sn++; ?></td>
<td><?php echo $myName[$x]; ?></td>
<td><?php echo $myCadet[$x]; ?></td>
<td><?php echo $myTotal[$x]; ?></td>
<td><?php echo $myGrade[$x]; ?></td>
<td><?php echo number_format($myValue,2); ?> </td>
<td><?php //$position++;
$myposition = $position++;
if($myposition == '1') { echo '1st'; }
else if($myposition == '2') { echo '2nd'; }
else if($myposition == '3') { echo '3rd'; }
else echo $myposition.'th';
?> </td>
</tr>
}