uasort Sort an array with a user-defined comparison function and maintain index association booluasort arrayarray callbackcmp_function This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is used mainly when sorting associative arrays where the actual element order is significant. The comparison function is user-defined. &return.success; Please see usort and uksort for examples of user-defined comparison functions. See also usort, uksort, sort, asort, arsort, ksort, and rsort.