PHP From to email � Checkbox group?

Ok so I want people to fill in a form and when they press submit it gets sent to my email address… Everything is working fine I just need to know how to make the checkbox appear in my email, the free script I used didn’t have any checkbox and I don’t know how to write them

Here’s my PHP code:

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if(isset($_POST['email'])) {

	// EDIT THE 2 LINES BELOW AS REQUIRED
	$email_to = "mymail";
	$email_subject = "Un nouveau formulaire est rempli";  

	function died($error) {
	// your error code can go here
	echo "Il semble y avoir une erreur avec le formulaire que vous tentez d'envoyer.";
	echo "Voici ces erreurs:.";
	echo $error."";
	echo "Merci de les corriger avant de tenter de renvoyer le formulaire.";
	die();
	}           

	// validation expected data exists
	if(!isset($_POST['prenom']) ||
					 !isset($_POST['nom']) ||
					 !isset($_POST['sexe']) ||
					 !isset($_POST['telephone']) ||
					 !isset($_POST['email']) ||
					 !isset($_POST['experience'])) {
	died('Il semble y avoir une erreur avec le formulaire que vous tentez d'envoyer.');
	}  

	$prenom = $_POST['prenom']; // required
	$nom = $_POST['nom']; // required
	$sexe = $_POST['sexe']; // not required
	$telephone = $_POST['telephone']; // not required
	$email = $_POST['email']; // required
	$experience = $_POST['experience']; // required     

	$error_message = "";
	$email_exp = '/