str_split 中文问号问题, mb_split() 分解词组

用以下函数来代替str_split function mbStringToArray ($string) {     $strlen = mb_strlen($string);     while ($strlen) {         $array[] = mb_substr($string,0,1,"utf8");         $string = mb_substr($string,1,$strlen,"utf8");         $strlen = mb_strlen($string);     }     return $array; } print_r(mbStringToArray('我,的电,脑COM'));   要引用mbstring.dll这个扩展