automatic login to wordpress dashboard from another site

Question

I want to log in automatically to WP admin/dashboard from another site without going thru the login process.. I\'ve tried the following but with no luck:

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Answer 1

Try This complete code it working 100% First Website : http://firstwebsite.com and Second Website : http://secondwebsite.com

Now, first of all create a link on your first website, on which we want to click to go to our second website as a logged in user. So, in your first website create a link at your desired place as mentioned below :

user_email;
$user_login = $current_user->user_login;
if($user_email != ''){

$email_encoded = rtrim(strtr(base64_encode($user_email), '+/', '-_'), '='); 
$user_login_encoded = rtrim(strtr(base64_encode($user_login), '+/', '-_'), '='); 
echo 'Link to 
second website';
}?> 

Now, open our second website and create a new php file and name it as “sso.php”. Place this file at your root installation and just copy paste the below mentioned code in this file :

get_var($wpdb->prepare("SELECT * FROM ".$wpdb->users." WHERE user_email = %s", $received_email ) );

        wp_set_auth_cookie( $user_id); //login the previously exist user

        wp_redirect(site_url()); // put the url where you want to redirect user after logged in

}else {

        //register those user whose mail id does not exists in database 

        if(username_exists( $received_username )){

            //if username coming from first site exists in our database for any other user,
            //then the email id will be set as username
            $userdata = array(
            'user_login'  =>  $received_email,
            'user_email'  =>  $received_email, 
            'user_pass'   =>  $received_username,   // password will be username always
            'first_name'  =>  $received_username,  // first name will be username
            'role'        =>  'subscriber'     //register the user with subscriber role only
        );

        }else {

            $userdata = array(
            'user_login'  =>  $received_username,
            'user_email'  =>  $received_email, 
            'user_pass'   =>  $received_username,   // password will be username always
            'first_name'  =>  $received_username,  // first name will be username
            'role'        =>  'subscriber'     //register the user with subscriber role only
        );

        }


        $user_id = wp_insert_user( $userdata ) ; // adding user to the database

        //On success
        if ( ! is_wp_error( $user_id ) ) {
             
            wp_set_auth_cookie( $user_id); //login that newly created user
            wp_redirect(site_url()); // put the url where you want to redirect user after logged in

        }else{

            echo "There may be a mismatch of email/username with the existing record.
                  Check the users with your current email/username or try with any other account.";die;
        }


}

 die;

 } ?>