ksort
Description
int ksort ( array array [, int sort_flags])Sorts an array by key, maintaining key to data correlations. This is useful mainly for associative arrays.
You may modify the behavior of the sort using the optional parameter sort_flags, for details see sort().
See also asort(), arsort(), krsort(), uksort(), sort(), natsort(), and rsort().
Note: The second parameter was added in PHP 4.