PHP krsort() function

example

Sort the associative array in descending order by key name ：

<?php
$age=array("Bill"=>"60","Steve"=>"56","mark"=>"31");
krsort($age);
?>

Definition and Usage

krsort() Function to sort an associative array in descending order by key name .

grammar

krsort(array,sortingtype);

Parameters	describe
array	It's necessary . Specify the array to sort .
sortingtype	Optional . Specifies how to arrange the elements of an array / project . Possible value ：0 = SORT_REGULAR - Default . Put each item in the regular order （Standard ASCII, Don't change the type ）1 = SORT_NUMERIC - Treat each item as a number .2 = SORT_STRING - Treat each item as a string .3 = SORT_LOCALE_STRING - Treat each item as a string , Based on the current locale （ It can be done by setlocale() Make changes ）.4 = SORT_NATURAL - Treat each item as a string , Use similar natsort() Natural ordering .5 = SORT_FLAG_CASE - Can combine （ Press bit or ）SORT_STRING or SORT_NATURAL Sort strings , Case insensitive .

• 0 = SORT_REGULAR - Default . Put each item in the regular order （Standard ASCII, Don't change the type ）
• 1 = SORT_NUMERIC - Treat each item as a number .
• 2 = SORT_STRING - Treat each item as a string .
• 3 = SORT_LOCALE_STRING - Treat each item as a string , Based on the current locale （ It can be done by setlocale() Make changes ）.
• 4 = SORT_NATURAL - Treat each item as a string , Use similar natsort() Natural ordering .
• 5 = SORT_FLAG_CASE - Can combine （ Press bit or ）SORT_STRING or SORT_NATURAL Sort strings , Case insensitive .

explain

krsort() The function sorts the array in reverse order by key , Keep the original key for the array value .

The optional second parameter contains additional sort flags .

If successful , Then return to TRUE, Otherwise return to FALSE.

Technical details

Return value ：	Return if successful TRUE, Return if failed FALSE.
PHP edition ：	4+