Summary of commonly used constants and variables in thinkphp

This article mainly introduces the commonly used systems in thinkphpConstants and variables, friends in need can refer to it

-------------- --------------------------System variables and constants used in templates---------- ----------------------------------
(1) System variable: Output the system in the template Variables: including server, env, session, post, get, request, cookie
{$Think.server.script_name} // Output $_SERVER variable
{$Think.session.session_id|md5} // Output $ _SESSION variable
{$Think.get.pageNumber} // Output $_GET variable
{$Think.cookie.name} // Output $_COOKIE variable

The above method can also be written as:
{$_SERVER.script_name} // Output $_SERVER variable
{$_SESSION.session_id|md5} // Output $_SESSION variable
{$_GET.pageNumber} // Output $_GET variable
{$ _COOKIE.name} // Output $_COOKIE variable

System constants: Use $Think.const to output
Note: server, cookie, and config are not case-sensitive, but variables are size-sensitive Write. For example:
{$Think.server.script_name} and {$Think.SERVER.script_name} are equivalent
SESSION, COOKIE also supports the output of two-dimensional array

For example :
{$Think.CONFIG.user.user_name}
{$Think.session.user.user_name}
The system does not support array output of more than three dimensions.

(2) Language variable: Output the current language definition value of the project

{$Think.lang.page_error}
{$Think.const.MODULE_NAME}

Or directly use
{$Think.MODULE_NAME}

(3) Special variables: Constant defined internally by the ThinkPHP system

{ $Think.version} //Version
{$Think.now} //Current time
{$Think.template|basename} //Template page
{$Think.LDELIM} // Template label Starting symbol
{$Think.RDELIM} //Template label ending symbol
(4) Configuration parameters: Output the configuration parameter value of the project

{$Think.config. db_charset}

The output value is the same as the result of C('db_charset').

----------------------------------------System constants used in Action- ---------------------------------------
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 directory
LIB_PATH // Project Class library directory
CACHE_PATH //Project template cache directory
CONFIG_PATH //ProjectConfiguration fileDirectory
LOG_PATH //Project log file directory
LANG_PATH //Project language file directory
TEMP_PATH //Project temporary file directory
PLUGIN_PATH //Project plug-in file directory
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 Windows environment
IS_LINUX //Whether it belongs to Linux environment
IS_FREEBSD //Whether it belongs to FreeBsd environment
NOW_TIME //Current timestamp
MEMORY_LIMIT_ON // Whether there is a memory usage limit
OUTPUT_GZIP_ON // Whether to enable 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 //Website root directory 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 of current operation (including path)
WEB_PUBLIC_URL //Website public directory
APP_PUBLIC_URL //Project public Template Directory
---------------------------------------- The system used in the template Constants----------------------------------------
ROOT // Website root directory Address
APP // Current project (entry file) address
URL // Current module address
ACTION // Current operation address
SELF // Current URL address
PUBLIC // Website public directory
../Public (not case sensitive) //Project public template directory
Note: When we use constants, after the template is loaded, view the source code in the browser, we observe some URLs that use constants , you will find a phenomenon, you cannot see the IP address of the server, the URL starts from the project name
, then why can you access the corresponding controller correctly? In fact, this is a joke played by the browser. When we move the mouse to the URL, right-click, copy the
URL in the source code, and paste it elsewhere, the server's IP will be displayed. , it can be seen that the server IP is included in the constant used in the URL.
------------------------------------- Custom constants---- ------------------------------------
In the project folder (eg: Home) Create a new common.php in the Common folder
Add the following statement:
define('XXX', XXX); //The first parameter is the constant name, and the second parameter is the constant value

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