php form post script

I created a form however the instuctions I followed for creating the PHP doc that gathers the information and emails it to me ony reads text fields. I need help with all the other types of  form content such as Pull down menus and check boxes

Here is the code on my php that gathers the text field into.

thank you in advance.

Abigail

$email = $_POST['email'];

$name = $_POST['name'];

$phone = $_POST['phone'];

$session_date = $_POST['session_date'];

$session_time = $_POST['session_time'];

$session_lenght = $_POST['session_lenght'];

$references = $_POST['references'];

$discribe_your_session = $_POST['discribe_your_session'];

$body = <<<EOD

<br><hr><br>

Name: $name <br>

Email: $email <br>

Phone: $phone <br>

Email: $email <br>

Session Date:  $session_date <br>

Session Time:  $session_time <br>

Sessiion Length: $session_lenght <br>

References: $references <br>

Discribe Your Session:  $discribe_your_session <br>