Nasıl benim oturum açma komut dosyası güvenli ve daha iyi sağlayabilirsiniz, Bu benim ilk koddur:

Yardım en takdir edilmektedir.

<?php

include ('../includes/db_connect.php');

$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$email = $_POST['email']; 
$mobile = $_POST['mobile']; 
$username = $_POST['username'];
$password = md5($_POST['password']);

// lets check to see if the username already exists

$checkuser = mysql_query("SELECT username FROM users WHERE username='$username'");

$username_exist = mysql_num_rows($checkuser);

if($username_exist > 0){
    echo "I'm sorry but the username you specified has already been taken.  Please pick another one.";
    unset($username);
    header("Location: /registration?registration=false");
    exit();
}

// lf no errors present with the username
// use a query to insert the data into the database.

$query = "INSERT INTO users (firstname, lastname, email, mobile, username, password)
VALUES('$firstname', '$lastname','$email', '$mobile','$username', '$password')";
mysql_query($query) or die(mysql_error());
mysql_close();

echo "You have successfully Registered";
header("Location: /registration?registration=true");   
// mail user their information

//$yoursite = ‘www.blahblah.com’;
//$webmaster = ‘yourname’;
//$youremail = ‘youremail’;
//    
//$subject = "You have successfully registered at $yoursite...";
//$message = "Dear $firstname, you are now registered at our web site.  
//    To login, simply go to our web page and enter in the following details in the login form:
//    Username: $username
//    Password: $password
//    
//    Please print this information out and store it for future reference.
//    
//    Thanks,
//    $webmaster";
//    
//mail($email, $subject, $message, "From: $yoursite <$youremail>\nX-Mailer:PHP/" . phpversion());
//    
//echo "Your information has been mailed to your email address.";

?>