Import files uploaded on server to Wordpress

import.php

<?php

# If placed in wp-content/uploads
$path_to_wp_blog_header = '../../wp-blog-header.php';
# Directory relative to wp-content/uploads
$dir = 'import';
# Attach to post ID
$post_id = 0;

error_reporting(E_ALL);

include $path_to_wp_blog_header;

$upload_dir = wp_upload_dir();

function import_files_from_directory($dir) {
  $files = scandir($dir);
  # Linux
  $files = array_diff($files, array('.', '..'));
  
  echo 'Importing files from directory: ' . $dir . '<br>';
  
  foreach ($files as $basename) {
    $fullname = $dir . '/' . $basename;
    if (is_dir($fullname)) {
      import_files_from_directory($dir);
    }
    else { 
      $filetype = wp_check_filetype($basename, null);
      $id = wp_insert_attachment(array(
        'guid' => $fullname,
        'post_mime_type' => $filetype['type'],
        'post_title' => $basename,
        'post_content' => '',
        'post_status' => 'inherit'
      ), $fullname, 0);
      echo 'Imported file ' . $fullname . ' to media library with ID ' . $id . '<br>';
    }
  }
  unset($basename);
  echo '<br>';
}

import_files_from_directory($upload_dir['basedir'] . '/' . $dir);