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Introduction to User Authentication in PHP

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Verify Authentication

3:52 with Alena Holligan

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 0:00
    a New File named functions_auth.php. 0:05
    We'll also need to add this file to our bootstrap file. 0:11
    Duplicate that line and we'll change it to auth and then we can close it. 0:17
    In our functions_auth file, 0:23
    we're ready to create a new function. 0:27
    We'll name this isAuthenticated. 0:31
    This function will need to read our session to know if a user is logged in, 0:40
    for the session variable to work inside of this function, 0:45
    we'll need a way to access it. 0:49
    One simple approach is to call the global $session; For 0:51
    more options see the notes associated with this video. 0:56
    We can then use session->get and look for 1:02
    our' auth_logged_in' variable. 1:08
    The value of this variable should be true if the user is logged in. 1:14
    The get method allows us to specify a default value as the second parameter. 1:20
    So we'll use for our second parameter, false, 1:26
    then we can simply return those results. 1:31
    Either true, if the user is logged in, or false if the user is not logged in. 1:37
    Now, let's use that isAuthenticated function in our navigation to show 1:44
    the proper length. 1:49
    Under templates, We have a nav.php. 1:52
    We only want to add books if the user is authenticated. 1:58
    So we can add a conditional around that item. 2:03
    If isAuthenticated. 2:11
    And then 2:20
    endif;. 2:25
    Next, if the user is logged in, we don't need to show the login and register links. 2:30
    Instead, we want to show log out. 2:37
    So let's add another conditional. 2:41
    If, isAuthenticated. 2:42
    We're going to add a new item. 2:56
    So let's copy the Login. 2:58
    And then we can add an else. 3:00
    And finally, endif;. 3:09
    We'll change the login to Logout. 3:18
    And we'll link directly to procedures doLogout. 3:23
    Let's go back and refresh our browser to see the changes in our navigation. 3:31
    We can see the add book link which hasn't changed. 3:37
    But now instead of login and register we see Logout. 3:41
    But before that Logout will work we need to add that procedure. 3:46

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