Codice PHP:
<form method="post">
    <input type="checkbox" name="element[eta]" value="1" />Eta'
    <input type="checkbox" name="element[nome]" value="1" />Nome
    <input type="checkbox" name="element[cognome]" value="1" />Cognome
    <input type="submit" />
</form>
<pre>
<?php 
print_r
($_POST);
?>
</pre>