real_favicon.module

<?php

/**
 * @file
 * Contains real_favicon.module..
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function real_favicon_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the real_favicon module.
    case 'help.page.real_favicon':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Add responsive favicons to your site based on the code from http://realfavicongenerator.neet') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_page_attachments_alter().
 */
function real_favicon_page_attachments_alter(array &$attachments) {
  $theme = \Drupal::theme()->getActiveTheme()->getName();
  $realFaviconManager = \Drupal::service('real_favicon.manager');

  if ($tags = $realFaviconManager->getTags($theme)) {
    // Remove default favicon from html_head_link.
    if (!empty($attachments['#attached']['html_head_link'])) {
      foreach ($attachments['#attached']['html_head_link'] as $i => $item) {
        if (!empty($item) && is_array($item)) {
          foreach ($item as $ii => $iitem) {
            if (isset($iitem['rel']) && in_array($iitem['rel'], ['shortcut icon', 'icon'])) {
              unset($attachments['#attached']['html_head_link'][$i][$ii]);
            }
          }
          if (empty($attachments['#attached']['html_head_link'][$i])) {
            unset($attachments['#attached']['html_head_link'][$i]);
          }
        }
      }
      if (empty($attachments['#attached']['html_head_link'])) {
        unset($attachments['#attached']['html_head_link']);
      }
    }
    // Attach favicon tags.
    $attachments['#attached']['html_head'][] = [
      [
        '#type' => 'markup',
        '#markup' => $tags,
        '#allowed_tags' => ['link', 'meta'],
        '#cache' => [
          'tags' => $realFaviconManager->getCacheTags(),
        ],
      ],
      'real_favicon',
    ];
  }
}

/**
 * Load favicon by theme.
 *
 * @param string $theme_id
 *   The theme id.
 *
 * @return \Drupal\real_favicon\Entity\RealFavicon|null
 *   The real favicon entity.
 */
function real_favicon_load_by_theme($theme_id = NULL) {
  if (empty($active_theme)) {
    $active_theme = \Drupal::theme()->getActiveTheme()->getName();
  }
  return \Drupal::service('real_favicon.manager')->loadFavicon($active_theme);
}