冒泡排序

<?php
/**
 * Created by PhpStorm.
 * User: huangye
 * Date: 2015/8/26
 * Time: 18:57
 */

//大数排在后边
function bubbleSort($a_data)
{
    $len = count($a_data);
    for ($i = 0; $i < $len; $i++) {
        for ($j = 0; $j < $len - $i - 1; $j++) {
            if ($a_data[$j] > $a_data[$j + 1]) {
                $temp           = $a_data[$j];
                $a_data[$j]     = $a_data[$j + 1];
                $a_data[$j + 1] = $temp;
            }
        }
    }

    return $a_data;
}

$num = array(20, 40, 60, 80, 30, 70, 90, 10, 50, 0);
var_dump(bubbleSort($num));