Is there a way I can sort this array - php

Question

I want to sort a returned value from a while loop here is my code
public function Getter($stream){
$sql1 = "SELECT reg_no FROM hs_registration ";
$sql1.= "JOIN hs_students USING(reg_no) WHERE class_id = 2";
$result1 = $database->query($sql1);
$num1 = $database->num_rows($result1);
if($num1 > 0){
$records = array();
$number_of_sub = getNoSub();
while($row = mysqli_fetch_array($result1)){
//return individual score
$total = $this->totalScoreSpreadSheet($row['reg_no'], $stream);
$flyAvg = $total / $number_of_sub;
$records[] = number_format($flyAvg,2).' '.$row['reg_no'];
}
}
return $records;
}
$averages = Getter($stream);
foreach ($averages as $avg){
echo $avg
}
Please, I want to sort the output based on the avg with the students reg_no appended to it
Output
54.20 FMS34
91.00 FMS51
72.16 FMS64
44.81 FMS23
68.52 FMS30
48.65 FMS37
My desired output is
Output
91.00 FMS51
72.16 FMS64
68.52 FMS30
54.20 FMS34
48.65 FMS37
44.81 FMS23

Answer 1

If your leading numbers are always two digits, then a decimal point, the two digits, then rsort($records); would suffice.
If they might be anything else, then keep a separate sorting array, then use array_multisort() to modify the $records.
public function Getter($stream): array
{
$sql = "SELECT reg_no
FROM hs_registration
JOIN hs_students USING(reg_no)
WHERE class_id = 2";
$flyAvgs = [];
$records = [];
$number_of_sub = getNoSub();
foreach ($database->query($sql) as $row) {
$total = $this->totalScoreSpreadSheet($row['reg_no'], $stream);
$flyAvg = $total / $number_of_sub;
$flyAvgs[] = $flyAvg;
$records[] = number_format($flyAvg, 2) . ' ' . $row['reg_no'];
}
array_multisort($flyAvgs, SORT_DESC, $records);
return $records;
}