function facebook_pixel_preprocess_page in Facebook Pixel 7

Implements hook_preprocess_page().

See also

facebook_pixel_add_event()

File

./facebook_pixel.module, line 127

Drupal Module: Facebook Pixel.

Code

function facebook_pixel_preprocess_page(&$variables) {
  global $user;
  if (variable_get('facebook_pixel_exclude_admin_paths', 1) && path_is_admin(current_path()) || !facebook_pixel_user_visibility($user)) {
    return;
  }
  if ($pixel_id = variable_get('facebook_pixel_id')) {
    $script = "\n<!-- Facebook Pixel Code -->\n<script>\n!function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?\nn.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;\nn.push=n;n.loaded=!0;n.version='2.0';n.queue=[];t=b.createElement(e);t.async=!0;\nt.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window,\ndocument,'script','//connect.facebook.net/en_US/fbevents.js');\n\nfbq('init', '{$pixel_id}');\nfbq('track', 'PageView');\n";
    if (isset($_SESSION['facebook_pixel']) && is_array($_SESSION['facebook_pixel'])) {
      foreach ($_SESSION['facebook_pixel'] as $event) {
        if (strpos($event, ':') !== FALSE) {
          list($event, $entity_id) = explode(':', $event);
        }
        if (!empty($entity_id) && function_exists('facebook_pixel_data_' . $event)) {
          $data = call_user_func('facebook_pixel_data_' . $event, $entity_id);

          // Allow to alter data.
          drupal_alter('facebook_pixel_data_' . $event, $data, $entity_id);
          $script .= "fbq('track', '{$event}', " . drupal_json_encode($data) . ");\n";
        }
        else {
          $script .= "fbq('track', '{$event}');\n";
        }
      }
      unset($_SESSION['facebook_pixel']);
    }
    $script .= "</script>\n<noscript><img height='1' width='1' style='display:none' src='https://www.facebook.com/tr?id={$pixel_id}&ev=PageView&noscript=1' /></noscript>\n<!-- End Facebook Pixel Code -->\n";
    $element = array(
      '#type' => 'markup',
      '#markup' => $script,
      '#weight' => 1000,
    );
    drupal_add_html_head($element, 'facebook_pixel');
  }
}