6 calls to user_is_anonymous()

comment_form_submit in drupal/modules/comment/comment.module
Process comment form submissions; prepare the comment, store it, and set a redirection target.
hook_menu_site_status_alter in drupal/modules/system/system.api.php
Control site status before menu dispatching.
openid_menu_site_status_alter in drupal/modules/openid/openid.module
Implements hook_menu_site_status_alter().
openid_test_menu_site_status_alter in drupal/modules/openid/tests/openid_test.module
Implements hook_menu_site_status_alter().
user_menu_site_status_alter in drupal/modules/user/user.module
Implements hook_menu_site_status_alter().
user_register_access in drupal/modules/user/user.module
Determines if the current user has access to the user registration page.