Introduction to commonly used system constants and system variables in thinkphp

This article mainly introduces the system constants and variables commonly used in thinkphp. Friends who need it can refer to it

-------------------------- --------------------System variables and constants used in templates---------------------- ------------------
(1) System variables: Output system variables in the template: including server, env, session, post, get , request, cookie

{$Think.server.script_name} // 输出$_SERVER变量
{$Think.session.session_id|md5} // 输出$_SESSION变量  
{$Think.get.pageNumber} // 输出$_GET变量  
{$Think.cookie.name}  // 输出$_COOKIE变量

The above method can also be written as:

{$_SERVER.script_name} // 输出$_SERVER变量 
{$_SESSION.session_id|md5} // 输出$_SESSION变量  
{$_GET.pageNumber} // 输出$_GET变量  
{$_COOKIE.name}  // 输出$_COOKIE变量

System constants: Use $Think.const output
Note: server, cookie, and config are not case-sensitive, but variables are case-sensitive. For example:

{$Think.server.script_name}和{$Think.SERVER.script_name}等效

SESSION and COOKIE also support the output of two-dimensional arrays

For example:

{$Think.CONFIG.user.user_name}
{$Think.session.user.user_name}

The system does not support arrays with more than three dimensions output.

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

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

or use

{$Think.MODULE_NAME}

## directly #(3) Special variables: Constants defined internally by the ThinkPHP system

{$Think.version}  //版本
{$Think.now} //现在时间   
{$Think.template|basename} //模板页面   
{$Think.LDELIM} //模板标签起始符号   
{$Think.RDELIM} //模板标签结束符号

(4) Configuration parameters: Output the configuration parameter values ​​of the project

{$Think.config.db_charset}

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

----------------------------------------used in Action 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 directory
LIB_PATH // Project class library directory
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 //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 // Is there any 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 (including path) for the current operation
WEB_PUBLIC_URL //Website public directory
APP_PUBLIC_URL //Project public template directory
---- ------------------------------------ System constants used in templates-------- --------------------------------
__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 and view the source code in the browser after the template is loaded, we observe some URLs that use constants and we will find a phenomenon that cannot be seen The IP address of the server and the URL start from the project name
, so why can the corresponding controller be accessed correctly? In fact, this is a joke played by the browser on us. 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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