Question

I am trying to create an email validation form for my database but am having a number of issues. When i try and run the code below i get the error no database selected.

I also get an undefined variable error. I want the put the name of the user into my database under the username field, but apparently $name is an undefined variable. error on line xx undefined variablemysql_query("INSERT INTO registrations (username, password, email, hash) VALUES( '". mysql_real_escape_string($name) ."',.

I am using WAMP server. The name of the database is sitememberdetails, and the name of the
table i need the information put into is registrations. I am pretty new to this – Could anyone tell me how i would define the variable and how i select the db( even though it already appears to be selected?)

     <?php

             $host = "localhost";
             $username = "";
             $password = "";
             $databasename = "sitememberdetails";
             $email="[e-mail]";


              $connection = mysql_connect($host,$username,$password) or die        
             ("Error: ".mysql_error());

               mysql_select_db($databasename);("sitememberdetails") or  

               die(mysql_error());   



                    if(isset($_POST['name']) && !empty($_POST['name']) AND  

                    isset($_POST['email']) && !empty($_POST['email'])){  
                     $name = mysql_real_escape_string($_POST['name']);  
                     $email = mysql_real_escape_string($_POST['email']); }  



                      if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a- 

                        z0-9-]+)*(\.[a-z]{2,3})$/i", $email)){

$msg = 'The email you have entered is invalid, please try again.';  
                }else{  

                    $msg = 'Your account has been made, <br /> please verify it     

              by clicking the activation link that has been send to  

                 your email.';  
                       }  


                        $hash = md5( rand(0,1000) ); 


                         $password = rand(1000,5000); 



                        mysql_query("INSERT INTO registrations (username, password,  

                          email, hash) VALUES( 
                          '". mysql_real_escape_string($name) ."', 
                          '". mysql_real_escape_string(md5($password)) ."', 
                          '". mysql_real_escape_string($email) ."', 
                          '". mysql_real_escape_string($hash) ."') ") or  

                          die(mysql_error());



                             $to      = $email; // Send email to our user  
                      $subject = 'Signup | Verification'; // Give the email a subject  
                      $message = ' 
                       Thanks for signing up! 
                      Your account has been created, you can login with the following  

                       credentials after you have activated your account by pressing  

                       the url below. 

                 Username: '.$name.' 
                 Password: '.$password.' 

                      Please click this link to activate your account: 
                      http://www.yourwebsite.com/verify.php?email='.$email.'& 

                      hash='.$hash.' 
                       ';  
                     $headers = 'From:[e-mail]' . "\r\n"; // Set from  

                       headers  
                       mail($to, $subject, $message, $headers); // Send our email  


                        ?>

Answer 1

try changing this code

mysql_select_db($databasename);("sitememberdetails") or  

           die(mysql_error());

to this

mysql_select_db($databasename) or  die(mysql_error());

EOL;

if (database_connection) {
unset($undefined_variable_error)
} else {
echo $undefined_variable_error;
}
// Because mysql_real_escape_string needs an open mysql connection