EDIT:
How can we leave all the checkboxes checked after I submit and it comes back at the same page ? When I submit, they are "reset" :/
So here is my form code:
<form action="" method="post" id="filtre_form">
<h1 class="text-center">Filtre</h1>
<div class="col-md-6">
<h4 class="text-center">Colonne à Afficher</h4>
<div class="col-md-6">
<ul>
<li>
<label class="checkbox">
<input type="checkbox" value="model" name="checkbox[]" id="Modele"> Modèle
</label>
</li>
<li>
<label class="checkbox">
<input type="checkbox" value="date_envoie" name="checkbox[]" id="Date"> Date envoi
</label>
</li>
<li>
<label class="checkbox">
<input type="checkbox" value="distributeur" name="checkbox[]" id="Distributeur"> Distributeur
</label>
</li>