<form method="post" action="test.php">
	
   <p>Cochez les animaux que vous aimez:<br />   
       <input type="checkbox" name="chats" id="chats" /> <label for="chats">chats</label><br />
       
       <input type="checkbox" name="chiens" id="chiens" /> <label for="chiens">chiens</label><br />
       
       <input type="checkbox" name="poissons" id="poissons" /> <label for="poissons">poissons</label><br />
       
       <input type="checkbox" name="serpents" id="serpents" /> <label for="serpents">serpents</label>
   </p>
</form>