visualizza file sottocartella e scarica file

[fcfclean]

ciao e buona serata :) non riesco a capire perchè non mi scarica il file pdf e/o doc ma si vedono dei caratteri strani come se il file fosse danneggiato chiedo aiuto grazie

<?PHP
            
                
            // Define a function to list files and subfolders
                function list_files($dir) {
                  // Get an array of files and subfolders
                  $files = scandir($dir);
                  // Loop through the array
                  foreach ($files as $file) {
                    // Skip the current and parent directories
                    if ($file != "." && $file != "..") {
                      // Get the full path of the file or folder
                      $path = $dir . "/" . $file;
                      // Check if it is a file
                      if (is_file($path)) {
                        // Get the file name
                        $name = basename($path);
                        // Encode the file path
                        $url = urlencode($path);
                        // Create a download link
                        echo "Documento: <a href='download.php?file=$url'>$name</a><br>";
                      }
                      // Check if it is a folder
                      if (is_dir($path)) {
                        // Print the folder name
                        echo "Cartella: <b>$file</b>";
                        // Call the function recursively
                        list_files($path);
                      }
                    }
                  }
                }

                // Call the function with the main directory
                list_files("documenti/".basename($_SESSION['username']));
                ?>
                            ------------------------------------
                           download.php

                          <?php
if(isset($_GET['file'])){
    $var_1 = $_GET['file'];
$dir='documenti/';
}
?>
<?php
if(isset($_GET['file'])){
    $var_1 = $_GET['file'];
$file = $var_1;
if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}
echo "<h1>Content error</h1><p>il file non esiste!</p>";
}
?>

[fcfclean]

risolto non so il perchè ma ha funzionato alla grande! :D