bool|int compare(string $str1, string $str2) Not supported. Compare two Unicode strings.

string getSortKey(string $string) Not supported. Get sorting key for a string.

int getErrorCode() Returns collator's last error code. Always returns the UZEROERROR

bool asort(array $array, int $sortFlag = self::SORT_REGULAR) Sort array maintaining index association

bool setStrength(int $strength) Not supported. Set the collator's strength.

string getErrorMessage() Returns collator's last error message. Always returns the UZEROERROR_MESSAGE

bool setAttribute(int $attr, int $val) Not supported. Set a collator's attribute.

string getLocale(int $type = Locale::ACTUAL_LOCALE) Returns the collator's locale.

bool sortWithSortKeys(array $arr) Not supported. Sort array using specified collator and sort

bool|int getAttribute(int $attr) Not supported. Get a value of an integer collator attribute