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php数组函数序列之krsort()- 对数组的元素键名进行降序排序,保持

Jun 06, 2016 pm 08:39 PM
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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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