3 calls to drupal_clear_css_cache()

drupal_flush_all_caches in includes/common.inc: Flushes all cached data on the site.
theme_disable in includes/theme.inc: Disables a given list of themes.
theme_enable in includes/theme.inc: Enables a given list of themes.

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.