Untitled

<?php

$numbers = [4, 2, 5, 6, 1, 9, 8, 3, 7];


for($i = 0; $i < sizeof($numbers); $i++){
    

    for($j = 0; $j < sizeof($numbers); $j++){

        if($numbers[$i] < $numbers[$j]){
            
            $temp = $numbers[$j];
            $numbers[$j] = $numbers[$i];
            $numbers[$i] = $temp;
        }

    }

}

print_r($numbers);