Php login Advanced Validations

[friendeyz]

If a user wants to go to profile.php and I assumed that the user is not logged in.
Now i want to redirect the user to login.php and in the login.php will now echo something like YOU MUST LOGIN TO VIEW THIS PAGE and after the user loged in will take the user to the profile.php which the user requested

How will i do that stuff and and also after echoing YOU MUST LOGIN TO VIEW THIS PAGE I will want the echoed content to disappear and show only once so that there will be room to echo login errors.
Can someone Help Thanks

[Dormilich]

this is usually done using sessions. you check in the session if the user’s state is loggen in, and if not you redirect him to the login page.

[Bharat383]

You can check with session. if the require session is not set on the profile page directly redirect him to login page otherwise if you want to keep him on the profile page, then you can display message there.

<?php
if(!isset($_SESSION['user_id']))
{
echo "You must have to login first.<a href='login.php'>click here to login</a>";
}
else
{
// code your profile page.
}

?>