PHP array function sequence ksort() sorts the element key names of the array in ascending order and maintains the index relationship_PHP tutorial

ksort() definition and usage
ksort() function sorts the array in ascending order by key name, retaining the original keys for the array values.

The optional second parameter contains additional sorting flags.

Returns TRUE if successful, otherwise returns FALSE.

Syntax
ksort(array,sorttype) Parameter Description
array Required. Specifies the array to be sorted.
sorttype optional. Specifies how to arrange the values ​​of an array. Possible values:

SORT_REGULAR - Default. Processed with their original type (without changing type).
SORT_NUMERIC - Handle values ​​as numbers
SORT_STRING - Handle values ​​as strings
SORT_LOCALE_STRING - Handle values ​​as strings, based on local settings*.


*: This value is newly added in PHP 4.4.0 and 5.0.2. Prior to PHP 6, the system locale was used, which could be changed with setlocale(). Since PHP 6, the i18n_loc_set_default() function must be used.

Example