problème de connexion a la base de donné (site de A-->Z jour 3)

je ne suis pa connecter a la base de donné la try et catch ne fonction pas meme si l'orsque je fais des erreurs a la configuration

<?php
class Model{
    static $connections=array();
    public $conf='default';
    public $table=false;
    public $db;
    function __construct(){
        //connection bd
        $conf=Conf::$databases$this->conf];
        if(isset(Model::$connections$this->conf])){
            $this->db=Model::$connections$this->conf];
            return true;
        }
        try{ 
        $pdo= new PDO('mysql::host='.$conf'host'].';dbname='.$conf'database'].';',$conf'login'],$conf'password']);
        Model::$connections$this->conf]=$pdo;
        $this->db=$pdo;
            }
            catch(PDOException $e){
                if(Conf::$debug >=1){
                    die(print_r($e->getMessage()));
                }
                else{
                    die("Impossible de se connecter a la base de donnee");
                }

            }
            //ini qqe variable
            if($this->table===false){
                $this->table=strtolower( get_class($this)).'s';

            }
    }
    function find($req){
        $sql='SELECT * FROM '.$this->table .'as '.get_class($this).'';
        if(isset($req'conditions'])){
            $sql='WEREE'.$req'conditions']; 
        }

        $pre=$this->db->prepare($sql);
        $pre->execute();
        return $pre->fetchAll(PDO::FETCH_OBJ);
}
function findFirst($req){
        return current( $this->find($req));

    }
}
?>

<?php
/**
* 
*/
class Conf
{
    static $debug=1;

static $databases=array(

    'default'=>array(
      'host'=>'localhost',
      'database'=>'test',
      'login'=>'root',
      'password'=>''

        )
);

}

?>

<?php
class PageController extends Controller{

 function view($id){
    $this->loadModel('Post');
    $post=$this->Post->findFirst(array(
        'conditions'=>'id=1'));
    $this->set('post',$post);
    print_r($post);

}

}
?>