krsort() 函数将数组按照键逆向排序，为数组值保留原来的键。可选的第二个参数包含附加的排序标志
krsort()定义和用法
krsort() 函数将数组按照键逆向排序，为数组值保留原来的键。
可选的第二个参数包含附加的排序标志。
若成功，则返回 TRUE，否则返回 FALSE。
语法
krsort(array,sorttype)参数 描述
array 必需。规定要排序的数组。
sorttype 可选。规定如何排列数组的值。可能的值：
SORT_REGULAR - 默认。以它们原来的类型进行处理（不改变类型）。
SORT_NUMERIC - 把值作为数字来处理
SORT_STRING - 把值作为字符串来处理
SORT_LOCALE_STRING - 把值作为字符串来处理，基于本地设置*。
*：该值是 PHP 4.4.0 和 5.0.2 新加的。在 PHP 6 之前，使用了系统的区域设置，可以用 setlocale() 来改变。自 PHP 6 起，必须用 i18n_loc_set_default() 函数。
例子
代码如下:
$my_array = array("a" => "Dog", "b" => "Cat", "c" => "Horse");
krsort($my_array);
print_r($my_array);
?>
输出：
Array
(
[c] => Horse
[b] => Cat
[a] => Dog
)
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