field_info_field_types($field_type) Return info from calling hook_field_info(). Read more about field_info_field_types($field_type)
field_info_cache_clear() Clears the field info cache without clearing the field data cache. Read more about field_info_cache_clear()
_field_info_collate_types($reset = FALSE) Collate and return information from hook_field_info, hook_field_widget_info, hook_field_formatter_info and hook_field_storage_info. Cache the results. Read more about _field_info_collate_types($reset = FALSE)
