Bubble Sort

Help me with this task, please. Here's my code

<?php

$chisli = "22
5 10 11 19 12 1 22 4 16 6 17 8 3 2 18 20 15 21 14 9 7 13"; 

$chislo = explode ("\n", $chisli);

$parameters = explode (" ", $chislo[1]);

$array_size = count($numbers);

$swap = 0;
$pass = 0;

for($i = 0; $i < count($parameters); $i++){
    if($parameters[$i] > $parameters[$i+1]){
        $pass++;
    }
    for($j= $i+1; $j < count($parameters); $j++){
        if($parameters[$i] > $parameters[$j]){
            $temp = $parameters[$j];
            $parameters[$j] = $parameters[$i];
            $parameters[$i] = $temp;
            $swap++;
        }
    }
}

echo $pass.' '.$swap;

?>