Création et utilisation d’une classe abstraite en PHP 5

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 classe abstraite
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<?php
     abstract class Nombres {
          private $valeur;
          abstract public function maValeur();
          public function initialiser() {
               $this->valeur = null;
          }
     }

     class Float extends Nombres {
          private $valeur;
          public function maValeur() {
               return (float)$this->valeur;
          }
     }

     $num = new Float;
?>

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