<?php
ob_start();
$host="*"; // Host name
$username="*"; // Mysql username
$password="*"; // Mysql password
$db_name="login"; // 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");

// Define $myusername and $mypassword
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$approved = stipslashes($approved);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$approved = mysql_real_escape_string($approved);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword' and approved='$approved'";
$result=mysql_query($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($approved != 'yes') {
echo "You haven't been approved as staff! - You can't Login yet.";
}else{

if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
session_register("myusername");
session_register("mypassword");
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
}
ob_end_flush();
?>