How to make a FORM (html) apparead in a PHP file than requeired be log-in to be shown

[Obsdark]

The question is simple

But I'm kinda a newbie so I'm gonna try to tell what's the problem and why i ask this

I'm doing a login system than, for different users showing different services, and until the moment all the login process has successfully ended just fine and works perfectly, BUT

some of this services i wanna add include the use of a form, the forms are HTML, and the "session_start( )" are PHP like all of you must know, so this is the question.

(already try with echo, btw)

Is there any way to add a form (html based) inside a PHP script to actually works depending of if it's working or not the `session_start( )`?

With the "Session_start( )" i mean if he is or not log-in
Have in mind that the service is gonna be used by the person who login

in other words:

        <?php
    session_start();
    echo $_SESSION['username'];
    echo $_SESSION['name'];
    echo $_SESSION['test'];
    if ($_SESSION['class'] === 7){ 
    } elseif ($_SESSION['class'] === 7 or 2) {
    // here i need a html form like this:
    // <form action="upload.php" method="post" enctype="multipart/form-data"><br />
    // <input type="file" name="info" /><br />
    // <input type="submit" value="Subir" />
    // </form>
    } elseif ($_SESSION['class'] === 7) {
    echo "esto también";
    } elseif ($_SESSION['class'] === 7) {
    echo "esto también";
    }
    ?>

Thanks in advance

PS: Any suggestion to improve the question, or question you have for clarification would be greatly appreciated too, just say it.