uninstall.php

<?php
/**
 * Fired when the h5p plugin is uninstalled.
 *
 * @package   H5P
 * @author    Joubel <contact@joubel.com>
 * @license   MIT
 * @link      http://joubel.com
 * @copyright 2014 Joubel
 */

// If uninstall not called from WordPress, then exit
if (!defined('WP_UNINSTALL_PLUGIN')) {
  exit;
}

require_once plugin_dir_path(__FILE__) . 'autoloader.php';
$plugin = H5P_Plugin::get_instance();
$plugin->get_library_updates();

global $wp_roles;
if (!isset($wp_roles)) {
  $wp_roles = new WP_Roles();
}

// Remove capabilities
$all_roles = $wp_roles->roles;
foreach ($all_roles as $role_name => $role_info) {
  $role = get_role($role_name);

  if (isset($role_info['capabilities']['manage_h5p_libraries'])) {
    $role->remove_cap('manage_h5p_libraries');
  }
  if (isset($role_info['capabilities']['edit_others_h5p_contents'])) {
    $role->remove_cap('edit_others_h5p_contents');
  }
  if (isset($role_info['capabilities']['edit_h5p_contents'])) {
    $role->remove_cap('edit_h5p_contents');
  }
  if (isset($role_info['capabilities']['view_h5p_results'])) {
    $role->remove_cap('view_h5p_results');
  }
}

/**
* Recursively remove file or directory.
*
* @since 1.0.0
* @param string $file
*/
function _h5p_recursive_unlink($file) {
  if (is_dir($file)) {
    // Remove all files in dir.
    $subfiles = array_diff(scandir($file), array('.','..'));
    foreach ($subfiles as $subfile)  {
      _h5p_recursive_unlink($file . '/' . $subfile);
    }
    rmdir($file);
  }
  elseif (file_exists($file)) {
    unlink($file);
  }
}

/**
 * Uninstall procedure to run per site level.
 *
 * @since 1.2.2
 */
function _h5p_uninstall() {
  global $wpdb;

  // Drop tables
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_contents");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_contents_libraries");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_contents_user_data");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_contents_tags");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_tags");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_results");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_libraries");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_libraries_libraries");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_libraries_languages");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_libraries_cachedassets");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_counters");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_events");
  $wpdb->query("DROP TABLE {$wpdb->prefix}h5p_tmpfiles");

  // Remove settings
  delete_option('h5p_version');
  delete_option('h5p_frame');
  delete_option('h5p_export');
  delete_option('h5p_embed');
  delete_option('h5p_copyright');
  delete_option('h5p_icon');
  delete_option('h5p_track_user');
  delete_option('h5p_minitutorial');
  delete_option('h5p_library_updates');
  delete_option('h5p_ext_communication');
  delete_option('h5p_save_content_state');
  delete_option('h5p_save_content_frequency');
  delete_option('h5p_update_available');
  delete_option('h5p_current_update');
  delete_option('h5p_update_available_path');
  delete_option('h5p_insert_method');
  delete_option('h5p_last_info_print');
  delete_option('h5p_multisite_capabilities');
  delete_option('h5p_site_type');
  delete_option('h5p_enable_lrs_content_types');
  delete_option('h5p_site_key');
  delete_option('h5p_content_type_cache_updated_at');
  delete_option('h5p_check_h5p_requirements');
  delete_option('h5p_hub_is_enabled');
  delete_option('h5p_send_usage_statistics');

  // Clean out file dirs.
  $upload_dir = wp_upload_dir();
  $path = $upload_dir['basedir'] . '/h5p';

  // Remove these regardless of their content.
  foreach (array('tmp', 'temp', 'libraries', 'content', 'exports', 'editor', 'cachedassets') as $directory) {
    _h5p_recursive_unlink($path . '/' . $directory);
  }

  // Only remove development dir if it's empty.
  $dir = $path . '/development';
  if (is_dir($dir) && count(scandir($dir)) === 2) {
    rmdir($dir);
  }

  // Remove parent if empty.
  if (is_dir($path) && count(scandir($path)) === 2) {
    rmdir($path);
  }
}

global $wpdb;
$wpdb->query("DROP TABLE {$wpdb->base_prefix}h5p_libraries_hub_cache");

if (!is_multisite()) {
  // Simple uninstall for single site
  _h5p_uninstall();
}
else {
  // Run uninstall on each site in the network.
  $blog_ids = $wpdb->get_col("SELECT blog_id FROM {$wpdb->blogs}");
  $original_blog_id = get_current_blog_id();

  foreach ($blog_ids as $blog_id) {
    switch_to_blog($blog_id);
    _h5p_uninstall();
  }

  switch_to_blog($original_blog_id);
}