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In functions_auth.php we'll create a new function named isAuthenticated. This function will need to read our session to know if a user is logged in.
Verify isAuthenticated
File: templates/nav.php
<?php if (isAuthenticated()) : ?>
<li><a href="/add.php">Add Book</a></li>
<?php endif; ?>
<?php if (isAuthenticated()) : ?>
<li><a href="/procedures/doLogout.php">Logout</a></li>
<?php else: ?>
<li><a href="/login.php">Login</a></li>
<li><a href="/register.php">Register</a></li>
<?php endif; ?>
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In our inc folder, we're going to add
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a New File named functions_auth.php.
0:05
We'll also need to add this
file to our bootstrap file.
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Duplicate that line and we'll change
it to auth and then we can close it.
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In our functions_auth file,
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we're ready to create a new function.
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We'll name this isAuthenticated.
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This function will need to read our
session to know if a user is logged in,
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for the session variable to
work inside of this function,
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we'll need a way to access it.
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One simple approach is to
call the global $session; For
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more options see the notes
associated with this video.
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We can then use session->get and look for
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our' auth_logged_in' variable.
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The value of this variable should
be true if the user is logged in.
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The get method allows us to specify
a default value as the second parameter.
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So we'll use for
our second parameter, false,
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then we can simply return those results.
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Either true, if the user is logged in,
or false if the user is not logged in.
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Now, let's use that isAuthenticated
function in our navigation to show
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the proper length.
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Under templates, We have a nav.php.
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We only want to add books if
the user is authenticated.
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So we can add a conditional
around that item.
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If isAuthenticated.
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And then
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endif;.
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Next, if the user is logged in, we don't
need to show the login and register links.
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Instead, we want to show log out.
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So let's add another conditional.
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If, isAuthenticated.
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We're going to add a new item.
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So let's copy the Login.
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And then we can add an else.
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And finally, endif;.
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We'll change the login to Logout.
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And we'll link directly
to procedures doLogout.
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Let's go back and refresh our browser
to see the changes in our navigation.
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We can see the add book
link which hasn't changed.
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But now instead of login and
register we see Logout.
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But before that Logout will work
we need to add that procedure.
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