I am working on login logout using php with session concept. Created 4 files

1. login.php
2. checklogin.php
3. securepage.php
4. logout.php

I'm able to login with defined username and password when i logged in session gets started login.php will navigate to securepage.php if i copy securepage.php file in some other browser it doesnot gets open it will redirect to login.php vch works great.

But if i open securepage.php in same browser in another tab it is redirecting to login.php instead it should show securepage.php can somebody help me out in achieving it Thanks!

1.Login.php

    
        
    
    
        
Login Form
        

            USER ID: 

            PASSWORD: 

            
        
    

2.checklogin.php

3. securepage.php

";
        echo "Logout";
    }
    else
    {
        header('location:login.php');
    }
?>

4.logout.php