In this tutorial we will be covering Login.
We will be making three files
connect.php <--to connect to the database
login.php <--that will have the login form on it
auth.php <--will authorize the login, making sure the info is correct.

So first off your going to need to make a "connect.php" so that the login script can connect to the mysql database to get, and submit info.

connect.php
PHP Code:
<?php

$db = mysql_connect("localhost","root","") or die("Could not connect to db");
if(!$db)
die("no db");
if(!mysql_select_db("database",$db))
die("No Database Selected");

?>
Now im using "WAMP" as so i can set up PHP and MySQL dependent sites on my localhost.

Because you will need to set up a MySQL database for this.
PHP Code:
$db = mysql_connect("localhost","Mysqlusername","Mysqlpassword")
if(!mysql_select_db("Mysqldatabasename",$db)) 
login.php
PHP Code:
      <form method="POST" action="auth">
User Name   
        <input type="text" name="name" size="21">   
        <br>
        Password        
<input type="password" name="password" size"21" mask="x">   
        <br>
<input type="submit" value="Login" name="submit">
</form> 
auth.php
PHP Code:
<?php
include_once 'connect.php';
session_start();

if (isset($_POST['submit']))
{
  $user=$_POST['name'];
  $password=$_POST['password'];
  $user=strip_tags($user);
  $password=strip_tags($password);
  $password=md5($password);
  
  $query = "select name, password from user where name='$user' and '$password'";
  $result = mysql_query($query) or die("COULD NOT QUERY USER");
  $result2 = mysql_fetch_array($result);
  if ($result2)
  {
    $_SESSION['name']=$user;
    ?>
    
<script type="text/javascript">
window.location = "index.php"
</script>
<?php
  }
  else
  {
    echo "<big>Wrong Username Or Password.<a href='login.php'>Try Again</a></big>";
  }
}
?>
So you should really get to know how MySQL databases /php works before trying these sort of things, im kind of in a rush right now so i cant explain it much, so if you have any questions just PM
Enjoy
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