How to display alert if user has't logged in

Question

I have a package page. all users can access it. those who want to order this package must log in first. when the user hasn't logged in and they click the booking button a warning will appear. "You must log in". how can I set like that. this is the packages

Answer 1

The simplest way to do this is:

While creating links check if the user is logged in or not. If user is logged in then add url of the package, otherwise add a simple javascript code to open popup.

If you are using session then you might need to add something like this:

if (isset($_SESSION['user'])){ ?>
    <a href="http://www.example.com">Booking</a><?php
}
else{ ?>
    <a href="#" onclick="alert('You must log in')">Booking</a><?php
}

Also you would need to add redirection for non logged in users on the package page as well.