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<?php
$host="localhost"; // Host name
$username="XXXX"; // Mysql username
$password="XXXX"; // Mysql password
$db_name="XXXX"; // Database name
$tbl_name="members"; // Table name

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form
$salt = "456as4s54gfjio3u43";
$myusername=$_POST['myusername'];
$mypassword=MD5(MD5($_POST['mypassword'] . $salt));

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
session_start();
$_SESSION['userid'] = $row['id'];
$_SESSION['loggedin'] = true;
header("location:./cms");
}
else {
header("location:index.php?error=1");
}
?>
<doctype>
<html>
<head>
<title>
</title>
</head>
<body>
</body>
</html>