Untitled

Checklogin:
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<?php
$host="localhost"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name=""; // Database name
$tbl_name="login"; // 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'];
$user = $_POST['myusername'];

// 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);

// 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"

$sql1= "select res_id from login where username='$user' and password ='$mypassword'";
$result1=mysql_query($sql1);
$lol = mysql_fetch_row($result1);


$_SESSION['mypassword'] = $mypassword;
$_SESSION['myusername'] = $myusername;

header("location:login_success.php");
}
else {
  header("location:error.php");
}
?>

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Login_success.php

<?
session_start();
if(!session_is_registered(myusername)){
header("location:main_login.php");
}


$host="localhost"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name=""; // Database name
$tbl_name="login"; // 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");


?>


<html>
<body>

<?
    echo $_SESSION['myusername'];
?>


</body>
</html>