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Title	Object type	File name	Summary
_drupal_session_garbage_collection	function	includes/session.inc	Session handler assigned by session_set_save_handler().
_drupal_session_open	function	includes/session.inc	Session handler assigned by session_set_save_handler().
_drupal_session_read	function	includes/session.inc	Reads an entire session from the database (internal use only).
_drupal_session_regenerate_existing	function	includes/session.inc	Regenerates an existing session.
_drupal_session_write	function	includes/session.inc	Writes an entire session to the database (internal use only).
_drupal_set_preferred_header_name	function	includes/bootstrap.inc	Sets the preferred name for the HTTP header.
_drupal_should_strip_sensitive_headers_on_http_redirect	function	includes/common.inc	Determine whether to strip sensitive headers from a request when redirected.
_drupal_shutdown_function	function	includes/bootstrap.inc	Executes registered shutdown functions.
_drupal_strip_error_file_path	function	includes/errors.inc	Strip full path information from error details.
_drupal_theme_access	function	includes/theme.inc	Helper function for determining access to a theme.
_element_validate_integer_positive	function	modules/field/field.module	DEPRECATED: Helper form element validator: integer > 0.
_field_extra_fields_pre_render	function	modules/field/field.module	Pre-render callback to adjust weights and visibility of non-field elements.
_field_filter_items	function	modules/field/field.module	Helper function to filter out empty field values.
_field_filter_xss_allowed_tags	function	modules/field/field.module	List of tags allowed by field_filter_xss().
_field_filter_xss_display_allowed_tags	function	modules/field/field.module	Human-readable list of allowed tags, for display in help texts.
_field_form_state_parents	function	modules/field/field.form.inc	Returns the location of processing information within $form_state.
_field_info_collate_fields	function	modules/field/field.info.inc	Collates all information on existing fields and instances.
_field_info_collate_types	function	modules/field/field.info.inc	Collates all information on field types, widget types and related structures.
_field_info_prepare_extra_fields	function	modules/field/field.info.inc	Prepares 'extra fields' for the current run-time context.
_field_info_prepare_instance	function	modules/field/field.info.inc	Prepares an instance definition for the current run-time context.
_field_info_prepare_instance_display	function	modules/field/field.info.inc	Adapts display specifications to the current run-time context.
_field_info_prepare_instance_widget	function	modules/field/field.info.inc	Prepares widget specifications for the current run-time context.
_field_invoke_get_instances	function	modules/field/field.attach.inc	Helper for _field_invoke(): retrieves a list of instances to operate on.
_field_language_suggestion	function	modules/field/field.multilingual.inc	Process the given language suggestion based on the available languages.
_field_sort_items	function	modules/field/field.module	Helper function to sort items in a field according to user drag-n-drop reordering.
_field_sort_items_helper	function	modules/field/field.module	Sort function for items order. (copied form element_sort(), which acts on #weight keys)
_field_sort_items_value_helper	function	modules/field/field.module	Same as above, using ['_weight']['#value']
_field_sql_storage_columnname	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Generate a column name for a field data table.
_field_sql_storage_indexname	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Generate an index name for a field data table.
_field_sql_storage_query_columnname	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Field meta condition column callback.
_field_sql_storage_query_field_conditions	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Adds field (meta) conditions to the given query objects respecting groupings.
_field_sql_storage_query_join_entity	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Adds the base entity table to a field query object.
_field_sql_storage_revision_tablename	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Generate a table name for a field revision archive table.
_field_sql_storage_schema	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Return the database schema for a field. This may contain one or more tables. Each table will contain the columns relevant for the specified field. Leave the $field's 'columns' and 'indexes' keys empty to get only the base schema.
_field_sql_storage_tablealias	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Generates a table alias for a field data table.
_field_sql_storage_tablename	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Generate a table name for a field data table.
_field_sql_storage_write_compare	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Compare a single field value for both entities and tell us if it changed.
_field_sql_storage_write_compare_filter	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Cleanup field values for later values comparison.
_field_sql_storage_write_compare_filter_callback	function	modules/field/modules/field_sql_storage/field_sql_storage.module	Callback for array_filter().
_field_test_field_storage_query_sort_helper	function	modules/field/tests/field_test.storage.inc	Sort helper for field_test_field_storage_query().
_field_test_storage_data	function	modules/field/tests/field_test.storage.inc	Helper function: stores or retrieves data from the 'storage backend'.
_field_ui_add_default_view_mode_settings	function	modules/field_ui/field_ui.admin.inc	Populates display settings for a new view mode from the default view mode.
_field_ui_field_name_exists	function	modules/field_ui/field_ui.admin.inc	Render API callback: Checks if a field machine name is taken.
_field_ui_field_overview_form_validate_add_existing	function	modules/field_ui/field_ui.admin.inc	Validates the 'add existing field' row of field_ui_field_overview_form().
_field_ui_view_mode_menu_access	function	modules/field_ui/field_ui.module	Menu access callback for the 'view mode display settings' pages.
_field_write_instance	function	modules/field/field.crud.inc	Stores an instance record in the field configuration database.
_file_field_get_description_from_element	function	modules/file/file.field.inc	Retrieves the file description from a field field element.
_file_generic_settings_extensions	function	modules/file/file.field.inc	Element validate callback for the allowed file extensions field.
_file_generic_settings_file_directory_validate	function	modules/file/file.field.inc	Element validate callback for the file destination field.
_file_generic_settings_max_filesize	function	modules/file/file.field.inc	Element validate callback for the maximum upload size field.

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