Developer Tip: Multiple Google Analytics on Various Pages

Developer tip on placing multiple Google analytics codes on various pages.

MYMODULE = multi_ga

/**
* Implementation of hook_menu().
*/
function MYMODULE_menu() {
  $items['admin/config/multi_ga/settings-ga'] = array(
    'title' => 'Google analytic settings',
    'description' => 'Place google analytic setting for each pages.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('MYMODULE_ga_config'),
    'access arguments' => array('administer'),
  );
  return $items;
}

/**
 * Google Analytic settngs.
 */
function MYMODULE_ga_config($form_state) {
  $description = t('Separate each Google Analytic code by semicolon. individual by comma. e.g UA-52705955-1,news-events/*;');
  $format = t('
Format: google_analytic_code,path_pattern;');
  $form['MYMODULE_google_analytic_mapping'] = array(
    '#type' => 'textarea',
    '#title' => t('Google Analytic Pathwise Mapping.'),
    '#description' => $description . $format,
    '#default_value' => variable_get('MYMODULE_google_analytic_mapping', ''),
    '#required' => FALSE
  );
  return system_settings_form($form);
}

/**
 * Add css to a particular path.
 * @param  [type] $page [description]
 * @return [type]       [description]
 */
function MYMODULE_page_alter(&$page) {
  MYMODULE_extend_google_anaytics();
}

/**
 * Set Google Analytic ID for each path pattern settings.
 * @return [type]     [description]
 */
function MYMODULE_extend_google_anaytics() {
  $site_path = drupal_get_path_alias();
  $MYMODULE_google_analytic_mapping = MYMODULE_determine_ga_mappings('MYMODULE_google_analytic_mapping', '');
  foreach ($MYMODULE_google_analytic_mapping as $pos => $data_info) {
    foreach ($data_info as $path => $data) {
      if (drupal_match_path($site_path, $path)) {
        $google_id = drupal_strtoupper($data['name']);
        MYMODULE_apply_google_analytic($google_id);
      }
    }
  }
}

/**
 * Apply google Analytic on the page.
 * @param  [type] $google_id [description]
 * @return [type]            [description]
 */
function MYMODULE_apply_google_analytic($google_id) {
  if ($google_id != '') {
    $script = "var _gaq = _gaq || [];_gaq.push(['_setAccount', '$google_id']);_gaq.push(['_trackPageview']);(function() {var ga = document.createElement('script');ga.type = 'text/javascript';ga.async = true;ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';var s = document.getElementsByTagName('script')[0];s.parentNode.insertBefore(ga, s);})();";
    drupal_add_js($script, array('type' => 'inline', 'scope' => 'header'));
  }
}

 /**
 * Get Configuration processed in array form for Google Analytic.
 * @param  string $key [description]
 * @return [type]      [description]
 */
function MYMODULE_determine_ga_mappings($mapping_key, $default_data = '') {
  $ga_label = variable_get($mapping_key, $default_data);
  $ga_label = str_ireplace(" ", "", $ga_label);
  $ga_label_arr = explode(";", $ga_label);
  $ga_label_mapping = array();
  foreach($ga_label_arr as $pos => $data) {
    $data_arr = explode(",", $data);
    if (!isset($data_arr[0])) {
      continue;
    }
    $key = drupal_strtolower($data_arr[0]);
    $name = (isset($data_arr[1])) ? $data_arr[1] : '';
    if (empty($name)) {
      continue;
    }
    $ga_label_mapping[$pos][$name]['name'] = $key;
  }
  return $ga_label_mapping;
}