username should contain alphabets,numbers什么意思

cont username should contain alphabets,numbers什么意思 username 关于php login问题if($_POST['btnLogin']){$cont=new Sql('shop');unformcode();$obj=new tool();$username = $obj->StrToDBC(trim($_POST['username']));$password = $obj->StrToDBC(md5($_POST['password']));$login_his = trim($_POST['login_his']);$referer = cont是什么意思 cont:3722433991 The username and password should be entered exactly as you have set them up.求翻译 Please correct the issues below: Invalid Username, should be 4-12 alphanumerals in length 是什么意 form1.username. cont'd是什么意思呢? cont什么意思 电机里面CONT是什么意思 Cont 和 Sharp Username unavailable 意思请问Username unavailable是什么意思? Select a username是什么意思 Username already in use Username 什么意思? Choose Username是什么意思