In template :

<div class="critere">
<?php 
echo select_tag('critereAfficher', options_for_select(
$fichebiographique->getCritereChoixNames()), 'multiple=multiple');
?>
</div>

In action :
$critereAfficher = $this->getRequestParameter('critereAfficher');

		foreach($critereAfficher as $key => $value) {
			echo "cle: ". $key . "<br />";
			echo "valeur:" . $value ;
			
		}