文章标题

function substr_cut(user_name){strlen = mb_strlen(username,‘utf−8′);firstStr = mb_substr(username,0,1,‘utf−8′);lastStr = mb_substr(username,−1,1,‘utf−8′);returnstrlen == 2 ? $firstStr . str_repeat(‘‘, mb_strlen(username,′utf−8′)−1):firstStr . str_repeat(““, strlen−2).lastStr;
}