piwik.module in Piwik Web Analytics 5

File

piwik.module

<?php

/*
 * @file
 * Drupal Module: Piwik
 * Adds the required Javascript to the bottom of all your Drupal pages
 * to allow tracking by the Piwik statistics package.
 *
 * @author: Alexander Hass <www.hass.de>
 */
define('PK_TRACKFILES_EXTENSIONS', '7z|aac|arc|arj|asf|asx|avi|bin|csv|doc|exe|flv|gif|gz|gzip|hqx|jar|jpe?g|js|mp(2|3|4|e?g)|mov(ie)?|msi|msp|pdf|phps|png|ppt|qtm?|ra(m|r)?|sea|sit|tar|tgz|torrent|txt|wav|wma|wmv|wpd|xls|xml|z|zip');
function piwik_help($section) {
  switch ($section) {
    case 'admin/settings/piwik':
      return t('<a href="@pk_url">Piwik - Web analytics</a> is an open source (GPL license) web analytics software. It gives interesting reports on your website visitors, your popular pages, the search engines keywords they used, the language they speak... and so much more. Piwik aims to be an open source alternative to Google Analytics.', array(
        '@pk_url' => 'http://www.piwik.org/',
      ));
  }
}
function piwik_menu($maycache) {
  global $user;
  $items = array();
  if ($maycache) {
    $items[] = array(
      'path' => 'admin/settings/piwik',
      'title' => t('Piwik'),
      'description' => t('Configure the settings used to generate your Piwik tracking code.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => 'piwik_admin_settings_form',
      'access' => user_access('administer piwik'),
      'type' => MENU_NORMAL_ITEM,
    );
  }
  else {
    $id = variable_get('piwik_site_id', '');

    // 1. Check if the GA account number has a value.
    // 2. Track page views based on visibility value.
    // 3. Check if we should track the currently active user's role.
    if (!empty($id) && _piwik_visibility_pages() && _piwik_visibility_user($user)) {
      $url_http = variable_get('piwik_url_http', '');
      $url_https = variable_get('piwik_url_https', '');
      $scope = variable_get('piwik_js_scope', 'footer');

      // Should a local cached copy of piwik.js be used?
      $script = 'var pkBaseURL = (("https:" == document.location.protocol) ? "' . check_url($url_https) . '" : "' . check_url($url_http) . '");';
      if (variable_get('piwik_cache', 0) && variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC && ($source = _piwik_cache($url_http . '/piwik.js'))) {
        drupal_add_js($source, 'module', $scope);
      }
      else {
        $script .= 'document.write(unescape("%3Cscript src=\'" + pkBaseURL + "/piwik.js\' type=\'text/javascript\'%3E%3C/script%3E"));';
      }
      drupal_add_js($script, 'inline', $scope);
    }
  }
  return $items;
}
function piwik_perm() {
  return array(
    'administer piwik',
    'opt-in or out of tracking',
    'use PHP for tracking visibility',
  );
}

/**
 * Implementation of hook_footer()  to insert Javascript at the end of the page
 */
function piwik_footer($main = 0) {
  global $user;
  $id = variable_get('piwik_site_id', '');

  // 1. Check if the GA account number has a value.
  // 2. Track page views based on visibility value.
  // 3. Check if we should track the currently active user's role.
  if (!empty($id) && _piwik_visibility_pages() && _piwik_visibility_user($user)) {
    $piwik_vars = array();
    $url_custom = '';
    if (module_exists('search') && variable_get('piwik_site_search', FALSE) && arg(0) == 'search' && ($keys = search_get_keys())) {
      $url_custom = drupal_to_js(url('search', 'query=' . $keys));
    }

    // Track access denied (403) and file not found (404) pages.
    if (function_exists('drupal_get_headers')) {
      $headers = drupal_get_headers();
      if (strstr($headers, 'HTTP/1.1 403 Forbidden')) {
        $url_custom = '"/403/URL=" + document.location.pathname + document.location.search + "/From=" + document.referrer';
      }
      elseif (strstr($headers, 'HTTP/1.1 404 Not Found')) {
        $url_custom = '"/404/URL=" + document.location.pathname + document.location.search + "/From=" + document.referrer';
      }
    }

    // Add any custom code snippets if specified.
    $codesnippet_before = variable_get('piwik_codesnippet_before', '');
    $codesnippet_after = variable_get('piwik_codesnippet_after', '');

    // Build settings code. See http://piwik.org/docs/javascript-tracking/
    $script = 'try {';
    $script .= 'var piwikTracker = Piwik.getTracker(pkBaseURL + "/piwik.php", ' . drupal_to_js(variable_get('piwik_site_id', '')) . ');';
    if (!empty($url_custom)) {
      $script .= 'piwikTracker.setDocumentTitle(' . $url_custom . ');';
    }
    if (variable_get('piwik_track', 1) && !(variable_get('piwik_trackfiles_extensions', PK_TRACKFILES_EXTENSIONS) == PK_TRACKFILES_EXTENSIONS)) {
      $script .= 'piwikTracker.setDownloadExtensions(' . drupal_to_js(variable_get('piwik_trackfiles_extensions', PK_TRACKFILES_EXTENSIONS)) . ');';
    }

    // Add custom variables.
    if (!empty($piwik_vars)) {
      $piwik_vars_fields = array();
      foreach ($piwik_vars as $name => $value) {
        $piwik_vars_fields[] = drupal_to_js($name) . ':' . drupal_to_js($value);
      }
      if (count($piwik_vars_fields) > 0) {
        $script .= 'piwikTracker.setCustomVars({ ' . implode(', ', $piwik_vars_fields) . ' });';
      }
    }
    if (!empty($codesnippet_before)) {
      $script .= $codesnippet_before;
    }
    $script .= 'piwikTracker.trackPageView();';

    // Add link tracking.
    if (variable_get('piwik_track', 1)) {
      $script .= 'piwikTracker.enableLinkTracking();';
    }
    if (!empty($codesnippet_after)) {
      $script .= $codesnippet_after;
    }
    $script .= '} catch(err) {}';
    drupal_add_js($script, 'inline', 'footer');
  }
}

/**
 * Implementation of hook_user().
 *
 * Allow users to decide if tracking code will be added to pages or not.
 */
function piwik_user($type, $edit, &$account, $category = NULL) {
  switch ($type) {
    case 'form':
      if ($category == 'account' && user_access('opt-in or out of tracking') && ($custom = variable_get('piwik_custom', 0)) != 0 && _piwik_visibility_roles($account)) {
        $form['piwik'] = array(
          '#type' => 'fieldset',
          '#title' => t('Piwik configuration'),
          '#weight' => 3,
          '#collapsible' => TRUE,
          '#tree' => TRUE,
        );
        switch ($custom) {
          case 1:
            $description = t('Users are tracked by default, but you are able to opt out.');
            break;
          case 2:
            $description = t('Users are <em>not</em> tracked by default, but you are able to opt in.');
            break;
        }
        $form['piwik']['custom'] = array(
          '#type' => 'checkbox',
          '#title' => t('Enable user tracking'),
          '#description' => $description,
          '#default_value' => isset($account->piwik['custom']) ? $account->piwik['custom'] : $custom == 1,
        );
        return $form;
      }
      break;
  }
}

/**
 * Implementation of hook_admin_settings() for configuring the module
 */
function piwik_admin_settings_form() {
  $form['account'] = array(
    '#type' => 'fieldset',
    '#title' => t('General settings'),
    '#collapsible' => FALSE,
  );
  $form['account']['piwik_site_id'] = array(
    '#type' => 'textfield',
    '#title' => t('Piwik site ID'),
    '#default_value' => variable_get('piwik_site_id', ''),
    '#size' => 15,
    '#maxlength' => 20,
    '#required' => TRUE,
    '#description' => t('The user account number is unique to the websites domain. Click the <strong>Settings</strong> link in your Piwik account, then the <strong>Sites</strong> tab and enter the <strong>ID</strong> into this field.'),
  );
  $form['account']['piwik_url_http'] = array(
    '#type' => 'textfield',
    '#title' => t('Piwik HTTP URL'),
    '#default_value' => variable_get('piwik_url_http', ''),
    '#size' => 80,
    '#maxlength' => 255,
    '#required' => TRUE,
    '#description' => t('The URL to your Piwik base directory. Example: "http://www.example.com/piwik".'),
  );
  $form['account']['piwik_url_https'] = array(
    '#type' => 'textfield',
    '#title' => t('Piwik HTTPS URL'),
    '#default_value' => variable_get('piwik_url_https', ''),
    '#size' => 80,
    '#maxlength' => 255,
    '#description' => t('The URL to your Piwik base directory with SSL certificate installed. Required if you track a SSL enabled website. Example: "https://www.example.com/piwik".'),
  );

  // Standard tracking configurations.
  $form['user_vis_settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('User specific tracking settings'),
    '#collapsible' => TRUE,
  );
  $form['user_vis_settings']['piwik_custom'] = array(
    '#type' => 'radios',
    '#title' => t('Custom tracking settings'),
    '#options' => array(
      t('Users cannot control whether they are tracked or not.'),
      t('Track users by default, but let individual users to opt out.'),
      t('Do not track users by default, but let individual users to opt in.'),
    ),
    '#description' => t('Allow individual users to customize the visibility of tracking in their account settings. Only users with %permission permission are allowed to set their own preference.', array(
      '%permission' => t('opt-in or out of tracking'),
    )),
    '#default_value' => variable_get('piwik_custom', 0),
  );

  // Render the role overview.
  $form['role_vis_settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('Role specific tracking settings'),
    '#collapsible' => TRUE,
  );
  $default_role_options = array();
  $default_roles = variable_get('piwik_roles', array());
  foreach ($default_roles as $default_rid => $checked) {
    if ($checked) {
      $default_role_options[] = $default_rid;
    }
  }
  $roles = _piwik_user_roles();
  $role_options = array();
  foreach ($roles as $rid => $name) {
    $role_options[$rid] = $name;
  }
  $form['role_vis_settings']['piwik_roles'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Add tracking for specific roles'),
    '#default_value' => $default_role_options,
    '#options' => $role_options,
    '#description' => t('Add tracking only for the selected role(s). If none of the roles are selected, all users will be tracked. If a user has any of the roles checked, that user will be tracked.'),
  );

  // Page specific visibility configurations.
  $form['page_vis_settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('Page specific tracking settings'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $access = user_access('use PHP for tracking visibility');
  $visibility = variable_get('piwik_visibility', 0);
  $pages = variable_get('piwik_pages', '');
  if ($visibility == 2 && !$access) {
    $form['page_vis_settings'] = array();
    $form['page_vis_settings']['visibility'] = array(
      '#type' => 'value',
      '#value' => 2,
    );
    $form['page_vis_settings']['pages'] = array(
      '#type' => 'value',
      '#value' => $pages,
    );
  }
  else {
    $options = array(
      t('Add to every page except the listed pages.'),
      t('Add to the listed pages only.'),
    );
    $description = t("Enter one page per line as Drupal paths. The '*' character is a wildcard. Example paths are %blog for the blog page and %blog-wildcard for every personal blog. %front is the front page.", array(
      '%blog' => 'blog',
      '%blog-wildcard' => 'blog/*',
      '%front' => '<front>',
    ));
    if ($access) {
      $options[] = t('Add if the following PHP code returns <code>TRUE</code> (PHP-mode, experts only).');
      $description .= ' ' . t('If the PHP-mode is chosen, enter PHP code between %php. Note that executing incorrect PHP-code can break your Drupal site.', array(
        '%php' => '<?php ?>',
      ));
    }
    $form['page_vis_settings']['piwik_visibility'] = array(
      '#type' => 'radios',
      '#title' => t('Add tracking to specific pages'),
      '#options' => $options,
      '#default_value' => $visibility,
    );
    $form['page_vis_settings']['piwik_pages'] = array(
      '#type' => 'textarea',
      '#title' => t('Pages'),
      '#default_value' => $pages,
      '#description' => $description,
      '#wysiwyg' => FALSE,
    );
  }

  // Link specific configurations.
  $form['linktracking'] = array(
    '#type' => 'fieldset',
    '#title' => t('Link tracking settings'),
    '#collapsible' => TRUE,
    '#collapsed' => FALSE,
  );
  $form['linktracking']['piwik_track'] = array(
    '#type' => 'checkbox',
    '#title' => t('Track download and outgoing links'),
    '#default_value' => variable_get('piwik_track', 1),
    '#description' => t('Enables tracking of clicks on download and outgoing links.'),
  );
  $form['linktracking']['piwik_trackfiles_extensions'] = array(
    '#type' => 'textfield',
    '#title' => t('File extensions to track'),
    '#default_value' => variable_get('piwik_trackfiles_extensions', PK_TRACKFILES_EXTENSIONS),
    '#description' => t('A pipe separated list of file extensions that should be tracked when clicked with regular expression support. Example: !extensions', array(
      '!extensions' => PK_TRACKFILES_EXTENSIONS,
    )),
    '#maxlength' => 255,
  );

  // Advanced feature configurations.
  $form['advanced'] = array(
    '#type' => 'fieldset',
    '#title' => t('Advanced settings'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['advanced']['piwik_cache'] = array(
    '#type' => 'checkbox',
    '#title' => t('Cache tracking code file locally'),
    '#description' => t("If checked, the tracking code file is retrieved from Piwik and cached locally. It is updated daily from your Piwik servers to ensure updates to tracking code are reflected in the local copy."),
    '#default_value' => variable_get('piwik_cache', 0),
  );
  if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PRIVATE) {
    $form['advanced']['piwik_cache']['#disabled'] = TRUE;
    $form['advanced']['piwik_cache']['#description'] .= ' ' . t('<a href="@url">Public file transfers</a> must be enabled to allow local caching.', array(
      '@url' => url('admin/settings/file-system', array(
        'query' => drupal_get_destination(),
      )),
    ));
  }
  $site_search_dependencies = '<div class="admin-dependencies">';
  $site_search_dependencies .= t('Depends on: !dependencies', array(
    '!dependencies' => module_exists('search') ? t('@module (<span class="admin-enabled">enabled</span>)', array(
      '@module' => 'Search',
    )) : t('@module (<span class="admin-disabled">disabled</span>)', array(
      '@module' => 'Search',
    )),
  ));
  $site_search_dependencies .= '</div>';
  $form['advanced']['piwik_site_search'] = array(
    '#type' => 'checkbox',
    '#title' => t('Track internal search') . ' (EXPERIMENTAL)',
    '#description' => t('If checked, internal search keywords are tracked. You must manually install and configure the Site Search plugin for your sites. For the setting <em>Search URL</em> use a value of <strong>search</strong> and for <em>Search Parameter</em> use a value of <strong>query</strong>. For more information see <a href="@url">SiteSearch plugin for piwik</a>.', array(
      '@url' => 'http://github.com/BeezyT/piwik-sitesearch/wiki',
    )) . $site_search_dependencies,
    '#default_value' => variable_get('piwik_site_search', FALSE),
    '#disabled' => module_exists('search') ? FALSE : TRUE,
  );
  $form['advanced']['codesnippet'] = array(
    '#type' => 'fieldset',
    '#title' => t('Custom JavaScript code'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
    '#description' => t('You can add custom Piwik <a href="@snippets">code snippets</a> here. These will be added to every page that Piwik appears on. <strong>Do not include the &lt;script&gt; tags</strong>, and always end your code with a semicolon (;).', array(
      '@snippets' => 'http://piwik.org/docs/javascript-tracking/',
    )),
  );
  $form['advanced']['codesnippet']['piwik_codesnippet_before'] = array(
    '#type' => 'textarea',
    '#title' => t('Code snippet (before)'),
    '#default_value' => variable_get('piwik_codesnippet_before', ''),
    '#rows' => 5,
    '#wysiwyg' => FALSE,
    '#description' => t('Code in this textarea will be added <strong>before</strong> piwikTracker.trackPageView().'),
  );
  $form['advanced']['codesnippet']['piwik_codesnippet_after'] = array(
    '#type' => 'textarea',
    '#title' => t('Code snippet (after)'),
    '#default_value' => variable_get('piwik_codesnippet_after', ''),
    '#rows' => 5,
    '#wysiwyg' => FALSE,
    '#description' => t("Code in this textarea will be added <strong>after</strong> piwikTracker.trackPageView(). This is useful if you'd like to track a site in two accounts."),
  );
  $form['advanced']['piwik_js_scope'] = array(
    '#type' => 'select',
    '#title' => t('JavaScript scope'),
    '#description' => t("<strong>Warning:</strong> Adding the external JavaScript files to the footer region is recommended for performance reasons."),
    '#options' => array(
      'footer' => t('Footer'),
      'header' => t('Header'),
    ),
    '#default_value' => variable_get('piwik_js_scope', 'footer'),
  );
  return system_settings_form($form);
}
function piwik_admin_settings_form_validate($form_id, $form_values) {
  if (!preg_match('/^\\d{1,}$/', $form_values['piwik_site_id'])) {
    form_set_error('piwik_site_id', t('A valid Piwik site ID is an integer only.'));
  }
  $url = $form_values['piwik_url_http'] . '/piwik.php';
  $result = drupal_http_request($url);
  if ($result->code != 200) {
    form_set_error('piwik_url_http', t('The validation of "@url" failed with error "@error" (HTTP code @code).', array(
      '@url' => check_url($url),
      '@error' => $result->error,
      '@code' => $result->code,
    )));
  }
  if (!empty($form_values['piwik_url_https'])) {
    $url = $form_values['piwik_url_https'] . '/piwik.php';
    $result = drupal_http_request($url);
    if ($result->code != 200) {
      form_set_error('piwik_url_https', t('The validation of "@url" failed with error "@error" (HTTP code @code).', array(
        '@url' => check_url($url),
        '@error' => $result->error,
        '@code' => $result->code,
      )));
    }
  }

  // This is for the Newbie's who cannot read a text area description.
  if (preg_match('/(.*)<\\/?script(.*)>(.*)/i', $form_values['piwik_codesnippet_before'])) {
    form_set_error('piwik_codesnippet_before', t('Do not include the &lt;script&gt; tags in the javascript code snippets.'));
  }
  if (preg_match('/(.*)<\\/?script(.*)>(.*)/i', $form_values['piwik_codesnippet_after'])) {
    form_set_error('piwik_codesnippet_after', t('Do not include the &lt;script&gt; tags in the javascript code snippets.'));
  }
}
function piwik_admin_settings_form_submit($form_id, $form_values) {

  // Trim some text area values.
  $form_values['piwik_pages'] = trim($form_values['piwik_pages']);
  $form_values['piwik_codesnippet_before'] = trim($form_values['piwik_codesnippet_before']);
  $form_values['piwik_codesnippet_after'] = trim($form_values['piwik_codesnippet_after']);
  system_settings_form_submit($form_id, $form_values);
}

/**
 * Implementation of hook_cron().
 */
function piwik_cron() {

  // Regenerate the piwik.js every day.
  if (time() - variable_get('piwik_last_cache', 0) >= 86400) {
    file_delete(file_directory_path() . '/piwik/piwik.js');
    variable_set('piwik_last_cache', time());
  }
}

/**
 * Download and cache the piwik.js file locally.
 * @param $location
 *   The full URL to the external javascript file.
 * @return mixed
 *   The path to the local javascript file on success, boolean FALSE on failure.
 */
function _piwik_cache($location) {
  $directory = file_directory_path() . '/piwik';
  $file_destination = $directory . '/' . basename($location);
  if (!file_exists($file_destination)) {
    $result = drupal_http_request($location);
    if ($result->code == 200) {

      // Check that the files directory is writable
      if (file_check_directory($directory, FILE_CREATE_DIRECTORY)) {
        return file_save_data($result->data, $directory . '/' . basename($location), FILE_EXISTS_REPLACE);
      }
    }
  }
  else {
    return $file_destination;
  }
}

/**
 * Tracking visibility check for an user object.
 *
 * @param $account
 *   A user object containing an array of roles to check.
 * @return boolean
 *   A decision on if the current user is being tracked by Piwik.
 */
function _piwik_visibility_user($account) {
  $enabled = FALSE;

  // Is current user a member of a role that should be tracked?
  if (_piwik_visibility_roles($account)) {

    // Use the user's block visibility setting, if necessary.
    if (($custom = variable_get('piwik_custom', 0)) != 0) {
      if ($account->uid && isset($account->piwik['custom'])) {
        $enabled = $account->piwik['custom'];
      }
      else {
        $enabled = $custom == 1;
      }
    }
    else {
      $enabled = TRUE;
    }
  }
  return $enabled;
}

/**
 * Based on visibility setting this function returns TRUE if GA code should
 * be added for the current role and otherwise FALSE.
 */
function _piwik_visibility_roles($account) {
  $enabled = FALSE;
  $roles = variable_get('piwik_roles', array());
  if (array_sum($roles) > 0) {

    // One or more roles are selected for tracking.
    foreach (array_keys($account->roles) as $rid) {

      // Is the current user a member of one role enabled for tracking?
      if (isset($roles[$rid]) && $rid == $roles[$rid]) {

        // Current user is a member of a role that should be tracked.
        $enabled = TRUE;
        break;
      }
    }
  }
  else {

    // No role is selected for tracking, therefor all roles should be tracked.
    $enabled = TRUE;
  }
  return $enabled;
}

/**
 * Based on visibility setting this function returns TRUE if GA code should
 * be added to the current page and otherwise FALSE.
 */
function _piwik_visibility_pages() {
  $visibility = variable_get('piwik_visibility', 0);
  $pages = variable_get('piwik_pages', '');

  // Match path if necessary.
  if (!empty($pages)) {
    if ($visibility < 2) {
      $path = drupal_get_path_alias($_GET['q']);

      // Compare with the internal and path alias (if any).
      $page_match = _piwik_match_path($path, $pages);
      if ($path != $_GET['q']) {
        $page_match = $page_match || _piwik_match_path($_GET['q'], $pages);
      }

      // When $visibility has a value of 0, the block is displayed on
      // all pages except those listed in $pages. When set to 1, it
      // is displayed only on those pages listed in $pages.
      $page_match = !($visibility xor $page_match);
    }
    else {
      $page_match = drupal_eval($pages);
    }
  }
  else {
    $page_match = TRUE;
  }
  return $page_match;
}

/**
 * D6 backport of drupal_match_path().
 */
function _piwik_match_path($path, $patterns) {
  static $regexps;
  if (!isset($regexps[$patterns])) {
    $regexps[$patterns] = '/^(' . preg_replace(array(
      '/(\\r\\n?|\\n)/',
      '/\\\\\\*/',
      '/(^|\\|)\\\\<front\\\\>($|\\|)/',
    ), array(
      '|',
      '.*',
      '\\1' . preg_quote(variable_get('site_frontpage', 'node'), '/') . '\\2',
    ), preg_quote($patterns, '/')) . ')$/';
  }
  return preg_match($regexps[$patterns], $path);
}

/**
 * D6 backport orders core standard roles on top and translate core roles.
 */
function _piwik_user_roles() {

  // System roles take the first two positions.
  $roles = array(
    DRUPAL_ANONYMOUS_RID => NULL,
    DRUPAL_AUTHENTICATED_RID => NULL,
  );
  $result = db_query('SELECT * FROM {role} ORDER BY name');
  while ($role = db_fetch_object($result)) {
    switch ($role->rid) {

      // We only translate the built in role names
      case DRUPAL_ANONYMOUS_RID:
        $roles[$role->rid] = t($role->name);
        break;
      case DRUPAL_AUTHENTICATED_RID:
        $roles[$role->rid] = t($role->name);
        break;
      default:
        $roles[$role->rid] = $role->name;
    }
  }

  // Filter to remove unmatched system roles.
  return array_filter($roles);
}

Functions

Name	Description
piwik_admin_settings_form	Implementation of hook_admin_settings() for configuring the module
piwik_admin_settings_form_submit
piwik_admin_settings_form_validate
piwik_cron	Implementation of hook_cron().
piwik_footer	Implementation of hook_footer() to insert Javascript at the end of the page
piwik_help
piwik_menu
piwik_perm
piwik_user	Implementation of hook_user().
_piwik_cache	Download and cache the piwik.js file locally.
_piwik_match_path	D6 backport of drupal_match_path().
_piwik_user_roles	D6 backport orders core standard roles on top and translate core roles.
_piwik_visibility_pages	Based on visibility setting this function returns TRUE if GA code should be added to the current page and otherwise FALSE.
_piwik_visibility_roles	Based on visibility setting this function returns TRUE if GA code should be added for the current role and otherwise FALSE.
_piwik_visibility_user	Tracking visibility check for an user object.

Constants

Name	Description
PK_TRACKFILES_EXTENSIONS