connexion PDO

try {
  $dns = 'mysql:host=localhost;dbname=**';
  $utilisateur = 'root';
  $motDePasse = '';
 
  // Options de connection
  $options = array(
    PDO::MYSQL_ATTR_INIT_COMMAND    => "SET NAMES utf8"
  );
 
  // Initialisation de la connection
  $db = new PDO( $dns, $utilisateur, $motDePasse, $options );
} catch ( Exception $e ) {
  echo "Connection à MySQL impossible : ", $e->getMessage();
  die();
}

class requetes 
{

 function selectUnProjet($id)
 {
    echo $id;
    $resultats= $db->query("SELECT * FROM projets WHERE No=".$id); 
    $resultats->setFetchMode(PDO::FETCH_OBJ);
    while($ligne = $resultats->fetch()) 
    {
      echo "allo".  $return = $this->cleanRow($ligne);
    }
    
     $result->free();
     echo $return;
     return $return;
 }
    
}

$req = new requetes();
$section = $req->selectUnProjet($_GET['noProjet']);

class requetes  extends PDO{
public function __construct($dsn,$username=null,$password=null,               $driver_options=null){
      parent::__construct($dsn, $username, $password, $driver);
   }
...   

<?php
class requetes extends PDO {

    public function __construct($dsn,$username=null,$password,$options=null){
          parent::__construct($dsn,$username,$password,$options);
    }
    
    public function selectUnProjet($id){
        echo $id;
        
        /*
        $resultats= $db->query("SELECT * FROM  WHERE No=".$id); 
        $resultats->setFetchMode(PDO::FETCH_OBJ);
        while($ligne = $resultats->fetch()) 
        {
          echo "allo".  $return = $this->cleanRow($ligne);
        }
        
         $result->free();
         echo $return;
         return $return;
         */
    }   

}

$options = array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"); 
$req = new requetes('mysql:host=localhost;dbname=test','root','',$options); 
$section = $req->selectUnProjet($_GET['noProjet']=5551); 
?>

$section = $req->selectUnProjet($_GET['noProjet']);

class requetes 
{

 function selectUnProjet($id)
 {
  
    $resultats= $db->query("SELECT * FROM projets WHERE No=".$id); 
    $resultats->setFetchMode(PDO::FETCH_OBJ);
    while($ligne = $resultats->fetch()) 
    {
      $return = $this->cleanRow($ligne);
    }
    
     $result->free();
     echo $return;
     return $return;
 }
    
}

value="<?php echo $section['titre']; ?>"

 public function selectUnProjet($id)
    {
        
        $sql = "SELECT * FROM projets WHERE No='".$id."'";
        try 
        {
          $stmt = $this->query($sql);
          while ($row = $stmt->fetch())
          {
            $return = $this->cleanRow($row);
          }
        }
        catch (PDOException $e)
        {
          print $e->getMessage();
        } 
        return $return;
    }   

echo $section['titre'];