Question

我希望在新数据库中检查用户名是否符合新用户名。如果找到用户名，请至少按数字重新生成用户名或者在名字和姓氏上附加一个漂亮的字符并再次检查新生成的用户名是否也不存在。

如果它不存在则运行查询INSERT。

我想要这个的原因是因为我不想要重复的用户名在数据库中。

我试过但它不适合我请帮忙。

<?php
    //check if username already exists

function checkusername($username){
    global $dbc_conn, $table_name;

    //CHECK IF A USERNAME EXISTS
    $query = mysqli_query($dbc_conn,"SELECT COUNT(username) FROM $table_name WHERE username ='{$username}'");
    $rows   =   mysqli_fetch_row($query);
    if(count($rows) > 0){
        return false;
    }else{
        return true;
    }
}



//This function create new account

function signup($fname, $lname , $regemail , $regpassword , $gender , $school , $day,$month,$year,$school){

    global $dbc_conn, $table_name;

    //CHECK IF EMAIL ALREADY EXISTS
    $query = mysqli_query($dbc_conn,"SELECT Email FROM $table_name WHERE Email ='{$regemail}'");

    if (mysqli_num_rows($query) > 0 ){
        $error ="<div class='error'><strong> <i class='fa fa-exclamation-triangle'></i> </strong>Sorry, It looks like you already have an account with us.</div>";

    }else{

        $username = strtolower($fname.$lname);

        //Check if username is do not exists, and if it exist
        while(checkusername($username)){
            //INSERT INTO DATABASE
            $query = "INSERT INTO users 
                            (username,FirstName,LastName,Email,
                             Password,Month,Day,Year,Gender,cell_group) 
                      VALUES(?,?,?,?,?,?,?,?,?,?)";

            //PREPARE QUERY
            $prepare = $dbc_conn ->prepare($query);

            //BIND QUERY
            $prepare->bind_param("ssssssisis",$username,$fname, 
                                              $lname , $regemail , 
                                              md5($regpassword) , $gender , 
                                              $school , $day,
                                              $month,$year,$school);

            //execute requery
            if($prepare->execute()){

                //SET SESSION
                $_SESSION['usigh-ses'] = mysqli_insert_id($dbc_conn);
                header("location:gettingstarted.php");

               //close connection
                mysqli_close($dbc_conn);
                exit;       
            };
        }

    }

}

?>

如何避免数据库中重复的用户名

0 个答案: