ThinkPHP system constants and predefined constants are summarized as follows:

1. System constants:

THINK_PATH//ThinkPHP System Directory: APP_PATH//Current Project Directory APP_NAME//Current Project Name MODULE_NAME//Current module name ACTION_NAME//Current operation name TMPL_PATH//Project Template Catalog LIB_PATH//Project Class Library Directory CACHE_PATH//Project Template Cache Directory CONFIG_PATH//Project Profile Directory LOG_PATH//Project Log File Directory LANG_PATH//Project Language Files Directory TEMP_PATH//Project Temporary Files Directory PLUGIN_PATH//Project plug-in file directory VENDOR_PATH//Party 3 Class Library Directory DATA_PATH//Project Data File Directory Does IS_APACHE//belong to Apache Whether IS_IIS//belongs to IIS Is IS_WIN//in an Windows environment Is IS_LINUX//in an Linux environment Is IS_FREEBSD//in an FreeBsd environment NOW_TIME//Current timestamp MEMORY_LIMIT_ON//Is there a memory usage limit MEMORY_LIMIT_ON//Is there a memory usage limit OUTPUT_GZIP_ON//Turn on output compression MAGIC_QUOTES_GPC // MAGIC_QUOTES_GPC THINK_VERSION//ThinkPHP version number LANG_SET//Browser language TEMPLATE_NAME//Current template name TEMPLATE_PATH//Current template path __ROOT__//Site root address __APP__//Current project (entry file) address __URL__//Current module address __ACTION__//Current Operation Address __SELF__//Current URL address TMPL_FILE_NAME//Default template name (including path) for the current operation WEB_PUBLIC_URL//Site Public Directory APP_PUBLIC_URL//Project Common Template Directory

2. Predefined constants:

WEB_LOG_ERROR=0//Error Log Type WEB_LOG_DEBUG=1//Debug Log Type SQL_LOG_DEBUG=2//SQL Log Type SYSTEM_LOG=0//System Logging MAIL_LOG=1//Mail Logging Logging in TCP_LOG=2//TCP mode FILE_LOG=3//Log in file mode DATA_TYPE_OBJ=1// Returns as an object DATA_TYPE_ARRAY=0//Return as an array URL_COMMON=0//Normal Mode URL URL_PATHINFO=1 // PATHINFO URL URL_REWRITE=2 // REWRITE URL HAS_ONE=1//HAS_ONE Association Definition BELONGS_TO=2//BELONGS_TO Association Definition HAS_MANY=3//HAS_MANY Association Definition MANY_TO_MANY=4/MANY_TO_MANY Association Definition EXISTS_TO_VAILIDATE = 0//Validate if the form has a field MUST_TO_VALIDATE = 1//Must be validated VALUE_TO_VAILIDATE = 2//Validate if the form value is not empty