php的urlencode函数是否支持Unicode字符

PHP ? urlencode ????????? Unicode ??????????????? URL ??,??? URL ???????urlencode ???????????(+),???????????????(%)??????????

??,??????? mb_convert_encoding ? urlencode ?????? Unicode ??????mb_convert_encoding ????? Unicode ??????? URL ??????

???????:

$unicode_string = "??,??!";
$encoded_string = urlencode(mb_convert_encoding($unicode_string, "UTF-8"));
echo $encoded_string;

???????? mb_convert_encoding ??? Unicode ?????? UTF-8 ??,???? urlencode ??????? URL ????????? 你好，世界！,?? Unicode ???? URL ?????