Problème pdo php

<?php
include('connect.php');
$par=$_GET['id'];
$query = $dbh->query("SELECT * FROM project WHERE id=$par");
    
while($article2 = $query->fetch())
{  

     $filename = basename($file);
     $file_extension = strtolower(substr(strrchr($filename,"."),1));

     switch( $file_extension ) {

        case "gif": $ctype="image/gif"; break;
        case "png": $ctype="image/png"; break;
        case "jpeg": $ctype="image/jpeg"; break;
        case "jpg": $ctype="image/jpg"; break;
        default:

     }   

     $imagedata = $article2['image'];      
     echo $imagedata;
     header('Content-type: ' . $ctype);

}

?>