How do I echo a clickable URL in PHP?

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PHP

HTML5

This is my first time asking a question here so please bare with me if i mess up this question.

I Have made a form with HTML and PHP, users can enter their details and press submit and it comes back on a PHP page with their answers, including a URL. And it all comes back as plain text. What i would like to happen is for when they enter their URL it comes back as a hyperlink/clickable link.

What I have tried:

This is the code i have right now.

<?php
             $firstname = $_POST['firstname'];
             $course = $_POST['course'];
             $projecturl = $_POST['projecturl'];


             echo "<p>You are <span class='textblue'> $firstname</span> and ";
             echo "your course at the college is: <span class='textblue'> $course </span></p> ";
            echo "your project url is: <span class='textblue'> $projecturl</span></p> ";