php 数组排序 array_multisort rsort krsort

这里主要是rsort krsort函数，他是对键名进行反序排序了，如果要数组元素值排序用sort就成了，array_multisort这个是对多维数组排序。
*/
$array = array(array('www.111cn.net',6,8),array(1,2,6));
print_r($array);
/*
array
(
    [0] => array
        (
            [0] => www.111cn.net
            [1] => 6
            [2] => 8
        )

    [1] => array
        (
            [0] => 1
            [1] => 2
            [2] => 6
        )

)
*/
array_multisort($array) ;//对二维数组进行排序
print_r($array);
/*
array
(
    [0] => array
        (
            [0] => www.111cn.net
            [1] => 6
            [2] => 8
        )

    [1] => array
        (
            [0] => 1
            [1] => 2
            [2] => 6
        )

)
*/

$ar = array('111cn.net',2,3,5);
rsort($ar);
print_r($ar);
/*
array
(
    [0] => 5
    [1] => 3
    [2] => 2
    [3] => 111cn.net
)
*/

krsort($ar);
print_r($ar);
/*
array
(
    [3] => 111cn.net
    [2] => 2
    [1] => 3
    [0] => 5
)*/