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<?php
interface Personnels {
    public function getNom();
    public function setNom($nom);
}

class Employes implements Personnels {
    private $nom;

    public function getNom() {
        return $this->nom;
    }

    public function setNom($nom) {
        return $this->nom = $nom;
    }
}

$interfaces = class_implements('Employes');
if (isset($interfaces['Personnels']))
{
 print 'La classe implémente déjà cette interface';
}

?>