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  1. #1
    valkosoft
    valkosoft is offline
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    Simple Register,login,logoff system

    First make a database and upload those tables into your database:

    users.sql

    Code:
    CREATE TABLE `users` (
    
    `id` INT( 50 ) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
    
    `username` VARCHAR( 15 ) NOT NULL ,
    
    `password` VARCHAR( 15 ) NOT NULL ,
    
    `email` VARCHAR( 50 ) NOT NULL
    
    )
    index.php

    Code:
    <?php
    
    
    //This will start a session
    
    session_start();
    
    
    $username = $_SESSION['username'];
    
    $password = $_SESSION['password'];
    
    
    //Check do we have username and password
    
    if(!$username && !$password){
    
    echo "Welcome Guest! <br> <a href=login.php>Login</a> | <a href=register.php>Register</a>";
    
    }else{
    
    echo "Welcome ".$username." (<a href=logout.php>Logout</a>)";
    
    }
    
    
    
    ?>
    Now let's make a register.php file

    Code:
    <?php
    
    
    //This function will display the registration form
    
    function register_form(){
    
    
    $date = date('D, M, Y');
    
    echo "<form action='?act=register' method='post'>"
    
    ."Username: <input type='text' name='username' size='30'><br>"
    
    ."Password: <input type='password' name='password' size='30'><br>"
    
    ."Confirm your password: <input type='password' name='password_conf' size='30'><br>"
    
    ."Email: <input type='text' name='email' size='30'><br>"
    
    ."<input type='hidden' name='date' value='$date'>"
    
    ."<input type='submit' value='Register'>"
    
    ."</form>";
    
    
    }
    
    
    //This function will register users data
    
    function register(){
    
    
    //Connecting to database
    
    $connect = mysql_connect("host", "username", "password");
    
    if(!$connect){
    
    die(mysql_error());
    
    }
    
    
    //Selecting database
    
    $select_db = mysql_select_db("database", $connect);
    
    if(!$select_db){
    
    die(mysql_error());
    
    }
    
    
    //Collecting info
    
    $username = $_REQUEST['username'];
    
    $password = $_REQUEST['password'];
    
    $pass_conf = $_REQUEST['password_conf'];
    
    $email = $_REQUEST['email'];
    
    $date = $_REQUEST['date'];
    
    
    //Here we will check do we have all inputs filled
    
    
    if(empty($username)){
    
    die("Please enter your username!<br>");
    
    }
    
    
    if(empty($password)){
    
    die("Please enter your password!<br>");
    
    }
    
    
    if(empty($pass_conf)){
    
    die("Please confirm your password!<br>");
    
    }
    
    
    if(empty($email)){
    
    die("Please enter your email!");
    
    }
    
    
    //Let's check if this username is already in use
    
    
    $user_check = mysql_query("SELECT username FROM users WHERE username='$username'");
    
    $do_user_check = mysql_num_rows($user_check);
    
    
    //Now if email is already in use
    
    
    $email_check = mysql_query("SELECT email FROM users WHERE email='$email'");
    
    $do_email_check = mysql_num_rows($email_check);
    
    
    //Now display errors
    
    
    if($do_user_check > 0){
    
    die("Username is already in use!<br>");
    
    }
    
    
    if($do_email_check > 0){
    
    die("Email is already in use!");
    
    }
    
    
    //Now let's check does passwords match
    
    
    if($password != $pass_conf){
    
    die("Passwords don't match!");
    
    }
    
    
    
    //If everything is okay let's register this user
    
    
    $insert = mysql_query("INSERT INTO users (username, password, email) VALUES ('$username', '$password', '$email')");
    
    if(!$insert){
    
    die("There's little problem: ".mysql_error());
    
    }
    
    
    echo $username.", you are now registered. Thank you!<br><a href=login.php>Login</a> | <a href=index.php>Index</a>";
    
    
    }
    
    
    switch($act){
    
    
    default;
    
    register_form();
    
    break;
    
    
    case "register";
    
    register();
    
    break;
    
    
    }
    
    
    ?>
    Now let's make a login page, login.php:

    Code:
    <?php
    
    session_start();
    
    
    //This displays your login form
    
    function index(){
    
    
    echo "<form action='?act=login' method='post'>" 
    
    ."Username: <input type='text' name='username' size='30'><br>"
    
    ."Password: <input type='password' name='password' size='30'><br>"
    
    ."<input type='submit' value='Login'>"
    
    ."</form>"; 
    
    
    }
    
    
    //This function will find and checks if your data is correct
    
    function login(){
    
    
    //Collect your info from login form
    
    $username = $_REQUEST['username'];
    
    $password = $_REQUEST['password'];
    
    
    
    //Connecting to database
    
    $connect = mysql_connect("host", "username", "password");
    
    if(!$connect){
    
    die(mysql_error());
    
    }
    
    
    //Selecting database
    
    $select_db = mysql_select_db("database", $connect);
    
    if(!$select_db){
    
    die(mysql_error());
    
    }
    
    
    //Find if entered data is correct
    
    
    $result = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'");
    
    $row = mysql_fetch_array($result);
    
    $id = $row['id'];
    
    
    $select_user = mysql_query("SELECT * FROM users WHERE id='$id'");
    
    $row2 = mysql_fetch_array($select_user);
    
    $user = $row2['username'];
    
    
    if($username != $user){
    
    die("Username is wrong!");
    
    }
    
    
    
    $pass_check = mysql_query("SELECT * FROM users WHERE username='$username' AND id='$id'");
    
    $row3 = mysql_fetch_array($pass_check);
    
    $email = $row3['email'];
    
    $select_pass = mysql_query("SELECT * FROM users WHERE username='$username' AND id='$id' AND email='$email'");
    
    $row4 = mysql_fetch_array($select_pass);
    
    $real_password = $row4['password'];
    
    
    if($password != $real_password){
    
    die("Your password is wrong!");
    
    }
    
    
    
    
    //Now if everything is correct let's finish his/her/its login
    
    
    session_register("username", $username);
    
    session_register("password", $password);
    
    
    echo "Welcome, ".$username." please continue on our <a href=index.php>Index</a>";
    
    
    
    
    
    }
    
    
    switch($act){
    
    
    default;
    
    index();
    
    break;
    
    
    case "login";
    
    login();
    
    break;
    
    
    }
    
    ?>
    And now.. logout.php

    Code:
    <?php
    
    session_start();
    
    
    //This function will destroy your session
    
    session_destroy();
    
    echo "You are now logged out! <a href=index.php>Index</a> or <a href=login.php>Login</a>";
    
    
    ?>
    I hope it helped.. have fun!

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  3. #2
    Smackie
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    nice little tutorial I know when I first started learning php I had tough time finding tutorials.


    Smackie

  4. #3
    GodLesZ
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    Quote Originally Posted by Smackie View Post
    nice little tutorial I know when I first started learning php I had tough time finding tutorials.
    NO ONE needs tutorials like this!
    He even forgot to use mysql_real_escape_string() to escape the strings before passing them to the mysql server.
    Just enter as password " ' OR '1 " (without the double quotes) and your are logged in, regardless of the username you choosed.

    Or Enter " '; DROP TABLE users; # " (without the double quotes) and you will kill the mysql user table.
    People like him should maybe post a tutorial for "how should i NOT copy & paste code" or even "how to code insecure".

    Learn before posting something like this!

  5. #4
    lightoflife
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    The other problem is that with this code, the password is in clear in the database so, if like the majority of people, the password entered for this application is the same as the password used for the email/facebook login and so on, the admin can know it.
    it's a general warning, take care of where u log in and never use different password for forum/critical applications

    and for your login code, add at least a md5 crypt to save in database and in the login script, compare the password crypted with the on in the database.

  6. #5
    P5yl0
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    nice.. but would be better with an encryption for pass
    Kin 164 - Im a Yello Seed^^

  7. #6
    witawat
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    can protect sql inject for code ?

  8. #7
    xMatrix
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    This is not safe. "if (! $ username &&! ​​$ password) {" check only "username" and "password" is non-NULL, and can be any value.

    To protect against SQL Injection use mysql_real_escape_string

    "SELECT * FROM users WHERE username = '". Mysql_real_escape_string ($ username). "' AND password = '". Mysql_real_escape_string ($ password). "'"

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