<?php

$numbers = array(5, 2, 65, 0, 32, -4, 7, -1);

$len = count($numbers);
$swapped = TRUE;

while ($swapped)
{
    $swapped = FALSE;

    for ($i = 1; $i < $len; $i++)
    {
        if ($numbers[$i - 1] > $numbers[$i])
        {
            $tmp = $numbers[$i];
            $numbers[$i] = $numbers[$i - 1];
            $numbers[$i - 1] = $tmp;
            $swapped = TRUE;
        }
    }

    $len--;
}

echo '<pre>;';
print_r($numbers);
echo '</pre>';