CONNEXION AVEC PDO

<?php 

/**


* Gestion de la base de données

*/
class Db{
 
 private $host ='localhost';
 private $name='tuto';
 private $user="root";
 private $pass='ygµpNMX/1234';

 private $connexion;

 function __construct($host=null,$name=null,$user=null,$pass=null){
  
  if($host != null){
   $this->host = $host;
   $this->name = $name;
   $this->user = $user;
   $this->pass = $pass;
  }

  try{

   $this->connexion = new PDO('mysql:host='.$this->host.';dbname='.$this->name,
    $this->user,$this->pass,array(
     PDO::MYSQL_ATTR_INIT_COMMAND =>'SET NAMES UTF8',
     PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING
     ));

  }catch (PDOException $e){
   echo 'Erreur : Impossible de se connecter  à la BD !';die();
  }
 }

 /* requete */

 public function query($sql , $data=array()){
  $req = $this->connexion->prepare($sql);
  $req->execute($data);
  return $req->fetchAll(PDO::FETCH_OBJ); 
 }

 public function tquery($sql , $data=array()){
  $req = $this->connexion->prepare($sql);
  $req->execute($data);
  return $req->fetchAll(PDO::FETCH_ASSOC); 
 }


 public function insert($sql , $data=array()){
  $req = $this->connexion->prepare($sql);
  $req->execute($data);
 }

 public function uniqueEmail($email){
  $req = $this->connexion->prepare('SELECT count(*) as nbre from users WHERE email=:email limit 1');
  $req->execute(array('email'=>$email));

  $reponse = $req->fetchAll(PDO::FETCH_ASSOC);
  return $reponse[0]['nbre'];

 }

}

EDIT : Ajout des balises de code