<?php

    $arr = array(1,4,2,9,0,10,12,3,7);

    foreach($arr as $val)

    {

       echo $val."--";

    }

    echo "<br/>";

    function bubble_sort(&$arr)

    {

        $len = count($arr);

        for($i = 1; $i <= $len - 1; $i++)

        {

            for($j = $i; $j >=0; $j--)

            {

                 if($arr[$j] < $arr[$j-1])

                 {

                      $temp      = $arr[$j];

                      $arr[$j]   = $arr[$j-1];

                      $arr[$j-1] = $temp;

                 }

            }

        }

    }

    bubble_sort($arr);

    foreach($arr as $val)

    {

       echo $val."--";

    }

?>