class Personne
{
    private $nom;
    private $adresse;
    private $tel;
    private $sexe;

    public function __construct($nom = '', $adresse = '', $tel = '', $sex = '')
    {
        $this->nom     = $nom;
        $this->adresse = $adresse;
        $this->tel     = $tel;
        $this->sexe    = $sex;
    }

     public function toHTML()
     {
         $html = sprintf('<strong>Nom :</strong><em>%s</em><br />',
                 htmlspecialchars($this->nom))
              . sprintf('<strong>Adresse :</strong><em>%s</em><br />',
                  htmlspecialchars($this->adresse))
              . sprintf('<strong>Tel :</strong><em>%s</em><br />',
                  htmlspecialchars($this->tel))
              . sprintf('<strong>Sexe :</strong><em>%s</em><br />',
                  htmlspecialchars($this->sexe));

         return $html;
      }

     public function formulaire()
     {
         $html = sprintf('<label>Nom:<input type="text" name="nom" value="%s"/></label><br />',
                 htmlspecialchars($this->nom))
               . sprintf('<label>Adresse:<textarea name="adresse" rows="8" cols="45">%s</textarea></label><br />',
                   htmlspecialchars($this->adresse))
               . sprintf('<label>Tel:<input type="text" name="tel" value="%s"/></label><br />',
                   htmlspecialchars($this->tel))
               . sprintf('<input type="radio" name="sexe" value="M" id="masculin" %s/> <label for="masculin">M</label><br />',
                   ($this->sexe === 'M' ? 'checked="checked"' : ''))
              . sprintf('<input type="radio" name="sexe" value="F" id="feminin" %s/> <label for="feminin">F</label><br />',
                  ($this->sexe === 'F' ? 'checked="checked"' : ''));

        return $html;
     }

     public function extraire_form()
     {
         foreach($_REQUEST as $key => $value)
         {
            $this->{$key} = $value;
         }
     }

     public function valider()
     {
         $this->extraire_form();

         foreach(get_object_vars($this) as $key => $value)
         {
             switch($key)
             {
                 case 'nom':
                 case 'adresse':
                     if(empty($value))
                     {
                         return false;
                     }
                     break;
                 case 'tel':
                     if(!preg_match('/\d{3}-\d{3}-\d{4}/', $value))
                     {
                         return false;
                     }
                     break;
                 break;
                 case 'sexe':
                     if($value !== 'M' && $value !== 'F')
                     {
                         return false;
                     }
                     break;
             }
         }

         return true;
    }
}