<?php
$host='**'; // Host name
$username='**'; // Mysql username
$password='**'; // Mysql password
$db_name='**'; // Database name
$tbl_name='**'; // Table name
// Connect to server and select databse.
mysql_connect($host, $username, $password)or die('cannot connect');
mysql_select_db($db_name)or die('cannot select DB');
// username and password sent from form
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
$encrypted_password=md5($mypassword);
// 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);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$encrypted_password'";
$result=mysql_query($sql);
// 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 "**.php"
session_register('myusername');
session_register('mypassword');
header('location:**');
}
else {
echo "Wrong Username or Password";
}
?>