PHP - Using if statement to check value in cookie

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Introduction

Consider the following code: 

<html> 
    <body> 
    <p> 
    <?php 
    if (isset($_COOKIE[username'])) { 
        echo "You are " . $_COOKIE['username']; 
    } else { 
        echo "You are not authenticated."; 
    } 
    ?> 
    </p> 
    <?php 
    if (isset($_GET['title']) && isset($_GET['author'])) { 
    ?> 
        <ul> 
            <li><b>Title</b>: <?php echo $_GET['title']; ?></li> 
            <li><b>Author</b>: <?php echo $_GET['author']; ?></li> 
        </ul> 
    <?php 
    } else { 
    ?> 
    <p>You are not looking for a book?</p> 
    <?php 
    } 
    ?> 
    </body> 
</html>

Here, we have mixed conditionals and HTML code in two different ways.

The first one opens a PHP tag, and adds an if...else clause that will print whether we are authenticated or not with an echo.

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