Here is a list of all struct and union fields with links to the structures/unions they belong to:

- $ -

$_abspath : GImage
$_access : Controller
$_add_path : FileBuild , FileField
$_add_related : ForeignKeyBuild , ForeignKeyField , ManyToManyBuild , ManyToManyField
$_add_related_url : ForeignKeyBuild , ForeignKeyField , ManyToManyBuild , ManyToManyField
$_affected : mysql , pdo , sqlsrv
$_align_dict : Template
$_allow_insertion : AdminTable
$_allow_numbers : Captcha
$_aut_pwd : auth
$_aut_pwd_length : auth
$_auth : Ldap
$_auto_increment : Build , Field
$_auto_now : DatetimeBuild , DatetimeField
$_auto_now_add : DatetimeBuild , DatetimeField
$_autofill : SlugBuild , SlugField
$_blackList : phpModuleView
$_blocks_number : Template
$_blocks_properties : Template
$_box_tpl_code : page
$_cache : menu , mysql , pdo , sqlsrv
$_cache_time : plugin_phpfastcache
$_check_is_constraint : Model
$_check_type : FileBuild , FileField
$_choice : BooleanBuild , BooleanField , EnumBuild , EnumField , MulticheckBuild , MulticheckField
$_class : Css , Frontend , Options
$_class_img : Controller
$_class_name : Controller , Locale
$_class_prefix : Options
$_class_www : Controller
$_cnt : mysql , pdo , sqlsrv
$_comment_moderation : page
$_comment_notification : page
$_connection : mysql , pdo , sqlsrv
$_content : Response , plugin_phpfastcache
$_content_disposition : ResponseFile
$_content_type : Response
$_controller : AdminTable , ManyToManyThroughBuild , ManyToManyThroughField , Model
$_controller_view : Router
$_css : Compressor
$_css_list : Css , Frontend
$_current_page : Paginator
$_data : Export , View
$_data_dir : Controller
$_data_www : Controller
$_db : Access , AdminTable , Controller , Core , Model , Options , Translation
$_db_charset : Db , mysql , pdo , sqlsrv
$_db_dbname : Db
$_db_host : Db , mysql , pdo , sqlsrv
$_db_name : mysql , pdo , sqlsrv
$_db_pass : Db
$_db_password : mysql , pdo , sqlsrv
$_db_schema : Db
$_db_user : Db , mysql , pdo , sqlsrv
$_dbconn : mysql , sqlsrv
$_dbms : Db , pdo , sqlcode
$_dbresults : mysql , sqlsrv
$_debug : Ldap
$_decimal_digits : Build
$_default : Build , Field , Widget
$_default_name : DirectoryBuild , DirectoryField
$_default_widget : Field
$_delete_deny : AdminTable
$_delete_file : FileBuild
$_dft_view_folder : View
$_dir : GImage
$_directory : FileBuild
$_doc_extension : AttachmentItem
$_ds : Cache
$_edit_deny : AdminTable
$_emitter_listeners : EventDispatcher
$_enabled : Cache
$_encoding : Response
$_entry_tpl_code : page
$_extension_img : GraphicsItem , PageEntry
$_extensions : FileBuild , FileField
$_field_object : Build
$_fields : Export , ModelForm
$_file_list : Locale
$_filename : ResponseFile
$_filesize_field : FileBuild
$_filter_add : AdminTable
$_filter_fields : AdminTable
$_filter_join : AdminTable
$_filter_search : Ldap
$_flag_language : language
$_fld : Cache
$_font_file : Captcha
$_foreign : ForeignKeyBuild , ForeignKeyField
$_foreign_controller : ForeignKeyBuild
$_foreign_order : ForeignKeyBuild , ForeignKeyField
$_foreign_where : ForeignKeyBuild , ForeignKeyField
$_form_id : Form
$_gform : MenuVoice
$_grp : Cache
$_head : Export
$_headers : Response
$_height : Captcha , GImage , ImageBuild , ImageField
$_hidden : Form
$_home : Access , Controller , Options , Template
$_ico_more : menu
$_identity_keyword : plugin_phpfastcache
$_ifp : AdminTable
$_image : GImage
$_image_type : GImage
$_img_extension : AttachmentItem
$_info_queries : mysql , pdo , sqlsrv
$_inst_mdl : searchSite
$_instance : Controller , Options
$_instance_class : Css
$_instance_label : Controller
$_instance_name : Controller
$_instances : Singleton
$_int_digits : Build
$_interface : PhpModule , Css , Skin , Template
$_interval : Paginator
$_is_constraint : Model
$_items_for_page : Paginator
$_items_number : Paginator
$_join_table : ManyToManyBuild , ManyToManyField
$_join_table_id : ManyToManyBuild
$_join_table_m2m_id : ManyToManyBuild
$_js : Compressor
$_justthese_search : Ldap
$_label : Build , Css , Widget
$_label_field1 : auth
$_label_field2 : auth
$_label_field3 : auth
$_lastid : mysql , sqlsrv
$_ldap_auth : auth
$_ldap_auth_only : auth
$_ldap_auth_password : auth
$_ldap_base_dn : Ldap
$_ldap_domain : Ldap
$_ldap_ds : Ldap
$_ldap_host : Ldap
$_ldap_log : Ldap
$_ldap_password : Ldap
$_ldap_port : Ldap
$_ldap_protocol_version : Ldap
$_ldap_single_user : auth
$_ldap_username : Ldap
$_lenght : Build , Field
$_letters : Captcha
$_list_display : AdminTable
$_list_remove : AdminTable
$_listeners : EventDispatcher
$_lng : Translation
$_lng_dft : Model
$_lng_nav : Model
$_lngDft : Translation
$_locale : Controller , Model
$_m2m : ManyToManyBuild , ManyToManyField , ManyToManyThroughBuild , ManyToManyThroughField
$_m2m_controller : ManyToManyBuild , ManyToManyThroughBuild , ManyToManyThroughField
$_m2m_order : ManyToManyBuild , ManyToManyField
$_m2m_where : ManyToManyBuild , ManyToManyField
$_max_file_size : FileBuild , FileField
$_mdlLink : Css , Frontend
$_menu_functions_list : menu
$_method : Form
$_model : Build , ModelForm
$_model_controller_class : TagBuild , TagField
$_model_controller_instance : TagBuild , TagField
$_model_form : AdminTable
$_model_label : Model
$_model_table_id : ManyToManyThroughBuild
$_module : Css , Frontend
$_module_app : Options
$_module_id : Frontend
$_multi_language : Form
$_name : Build , Captcha , Css , Field , Widget
$_newsletter_entries_number : page
$_newsletter_tpl_code : page
$_numbercols : pdo
$_numberrows : mysql , pdo , sqlsrv
$_numbers : Captcha
$_obj_cache : plugin_phpfastcache
$_options : auth , language , menu , phpModuleView , searchSite , Build
$_optionsLabels : auth , language , menu , phpModuleView , searchSite
$_order : Export
$_other_field1 : auth
$_other_field2 : auth
$_other_field3 : auth
$_p : Model
$_pages_number : Paginator
$_path : DirectoryBuild , DirectoryField , FileBuild , FileField
$_pdf_extension : AttachmentItem
$_pdo : pdo
$_permissions : Controller
$_plink : Controller
$_prefix : Cache , DirectoryBuild , DirectoryField , FileBuild , FileField
$_prefix_file : ImageBuild , ImageField
$_prefix_thumb : ImageBuild , ImageField
$_primary_key : Build , Field
$_pwd_length_max : auth
$_pwd_length_min : auth
$_pwd_numeric_number : auth
$_qry : mysql , sqlsrv
$_query_cache : mysql , pdo , sqlsrv
$_query_cache_time : mysql , pdo , sqlsrv
$_redirect : Exception403
$_refmodel : MulticheckBuild , MulticheckField
$_refmodel_controller : MulticheckBuild , MulticheckField
$_refmodel_order : MulticheckBuild , MulticheckField
$_refmodel_where : MulticheckBuild , MulticheckField
$_registry : AdminTable , Cache , Controller , Core , Document , Form , Frontend , Model , Router , Translation , View
$_remove_fields : ManyToManyThroughBuild
$_request : AdminTable , Document , Field , Form , Response , Model , Router
$_requestVar : Form
$_required : Build , Field
$_resize : ImageBuild , ImageField
$_result : pdo
$_rids : Export
$_rows : mysql , sqlsrv
$_s : Export
$_session : Access , AdminTable , Controller , Form , Locale
$_session_value : Form
$_show_stats : mysql , pdo , sqlsrv
$_showcase_auto_interval : page
$_showcase_auto_start : page
$_showcase_number : page
$_showcase_title : page
$_showcase_tpl_code : page
$_sql : mysql , sqlsrv
$_status_code : Response
$_status_text : Response
$_strings : Locale
$_structure : Model
$_sys_mdl : searchSite
$_table : Build , Export , GImage , Search
$_table_tag : GTag
$_table_tag_taggeditem : GTag
$_tbl_data : PhpModule , Css , Model
$_tbl_log_access : statistics
$_tbl_module : Css
$_tbl_opt : menu , page , phpModuleView
$_tbl_options : Options
$_tbl_translation : Translation
$_tbl_user_role : MenuVoice
$_tc : Cache
$_test_anonymous : Ldap
$_test_search : Ldap
$_thumb : ImageBuild , ImageField
$_thumb_height : ImageBuild , ImageField
$_thumb_width : ImageBuild , ImageField
$_time_queries : mysql , pdo , sqlsrv
$_title : attachment , graphics , language , menu , phpModuleView , searchSite , sysClass , Options
$_title_visible : phpModuleView
$_tmp_image : GImage
$_trd : Controller , Model
$_trnsl : CharBuild , CharField , EmailBuild , EmailField , SlugBuild , SlugField , TextBuild , TextField
$_types_allowed : FileBuild , FileField
$_um_dict : Template
$_unique_key : Build , Field
$_url : Redirect
$_url_class : Router
$_url_content : Document
$_url_instance : Router
$_url_method : Router
$_user_more : auth
$_user_name : Ldap
$_user_password : Ldap
$_user_view : auth
$_username_as_email : auth
$_users_for_page : auth
$_validation : Form
$_value : Build , Widget
$_value_input : Widget
$_value_retrieve : Widget
$_vars : Session
$_view : AdminTable
$_view_dir : searchSite , Controller
$_view_folder : View
$_view_input : Build , DatetimeBuild , DatetimeField
$_view_list : Frontend
$_view_tpl : View
$_widget : Build , Field
$_width : Captcha , GImage , ImageBuild , ImageField
$_xls_extension : AttachmentItem
$a : JSMin
$absolute_url : Request
$accept : MobileDetect
$b : JSMin
$columns : AttachmentCtg , AttachmentItem , Group , Permission , RegistrationProfile , RegistrationRequest , User , GraphicsItem , Lang , MenuVoice , ModuleInstance , PageCategory , PageComment , PageEntry , PhpModule , LogAccess , ModuleApp , Conf , Css , Skin , Template
$COOKIES : Request
$decimal_digits : Field
$devices : MobileDetect
$error : ReCaptchaResponse
$extension_media : User
$FILES : Request
$GET : Request
$id : Cache
$input : JSMin
$inputIndex : JSMin
$inputLength : JSMin
$int_digits : Field
$is_valid : ReCaptchaResponse
$isAndroid : MobileDetect
$isBlackberry : MobileDetect
$isGeneric : MobileDetect
$isIphone : MobileDetect
$isMobile : MobileDetect
$isOpera : MobileDetect
$isPalm : MobileDetect
$isWindows : MobileDetect
$lng_dft : User
$lng_nav : User
$lookAhead : JSMin
$META : Request
$method : Request
$output : JSMin
$path : Request
$POST : Request
$query_string : Request
$REQUEST : Request
$request_uri : Request
$root_absolute_url : Request
$session : Request
$sessionState : Session
$table : AttachmentCtg , AttachmentItem , Group , Permission , RegistrationProfile , RegistrationRequest , User , GraphicsItem , Lang , ModuleInstance , PageCategory , PageComment , PageEntry , PhpModule , LogAccess , ModuleApp , Conf , Css , Skin , Template
$table_block : Template
$table_group_perm : Group
$table_groups : RegistrationProfile , User
$table_more : User
$table_perm_user : Permission
$tbl_voices : MenuVoice
$url : Request
$user : Request
$userAgent : MobileDetect
$vars : Registry