System constants and predefined constants in ThinkPHP _ php instances

This article mainly introduces ThinkPHP system constants and predefined constants. If you need them, you can refer to the ThinkPHP system constants and predefined constants as follows:

1. System constants:

THINK_PATH // ThinkPHP system directory:
APP_PATH // current project directory
APP_NAME // current project name
MODULE_NAME // name of the current Module
ACTION_NAME // current operation name
TMPL_PATH // Project template directory
LIB_PATH // directory of the Project class library
CACHE_PATH // Project template cache directory
CONFIG_PATH // project configuration file directory
LOG_PATH // project log file directory
LANG_PATH // project language file directory
TEMP_PATH // temporary project file directory
PLUGIN_PATH // directory of the Project plug-in file
VENDOR_PATH // third-party class library directory
DATA_PATH // project data file directory
IS_APACHE // whether it belongs to Apache
IS_IIS // whether it belongs to IIS
IS_WIN // whether it belongs to the Windows Environment
IS_LINUX // whether it belongs to the Linux environment
IS_FREEBSD // whether it belongs to the FreeBsd Environment
NOW_TIME // current Timestamp
MEMORY_LIMIT_ON // whether the memory usage limit exists
MEMORY_LIMIT_ON // whether the memory usage limit exists
OUTPUT_GZIP_ON // whether to enable output Compression
MAGIC_QUOTES_GPC // MAGIC_QUOTES_GPC
THINK_VERSION // ThinkPHP version
LANG_SET // browser Language
TEMPLATE_NAME // name of the current template
TEMPLATE_PATH // current template path
// Website root directory address
/Index. php // address of the current project (entry file)
/Index. php/Article // address of the current Module
/Index. php/Article/detail // current operation address
/Php-weizijiaocheng-142626.html // current URL
TMPL_FILE_NAME // default Template Name (including path) for the current operation)
WEB_PUBLIC_URL // public website directory
APP_PUBLIC_URL // Project Public 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 // log recorded in the system mode
MAIL_LOG = 1 // mail method log
TCP_LOG = 2 // log recorded in TCP Mode
FILE_LOG = 3 // log recorded by file
DATA_TYPE_OBJ = 1 // returns an object
DATA_TYPE_ARRAY = 0 // returns an array
URL_COMMON = 0 // URL in Normal Mode
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_attributes = 3 // has_attributes Association Definition
Many_to_detail = 4 // many_to_detail Association Definition
EXISTS_TO_VAILIDATE = 0 // validate if a field exists in the form
MUST_TO_VALIDATE = 1 // verification required
VALUE_TO_VAILIDATE = 2 // verify if the form value is not empty