/** * Returns an array containing, for each field, the arary key used for that * field in self::$_fields. * * @return array */ static function &fieldKeys() { if (!self::$_fieldKeys) { self::$_fieldKeys = array('id' => 'id', 'file_type_id' => 'file_type_id', 'mime_type' => 'mime_type', 'uri' => 'uri', 'document' => 'document', 'description' => 'description', 'upload_date' => 'upload_date'); } return self::$_fieldKeys; }