System constants and pre-defined constants collections in thinkphp _php tutorial

Thinkphp system constants and pre-defined 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 action 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 file directory
Temp_path//Project temp 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//is a Windows environment
Is_linux//Whether it belongs to Linux Environment
IS_FREEBSD//Whether it belongs to the FREEBSD environment
Now_time//Current timestamp
memory_limit_on//Whether there is memory usage limit
memory_limit_on// Is there a memory usage limit
output_gzip_on//whether to 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__//web site root address
__app__// Current project (entry file) address
__url__//Current module address
__action__//Current action address
__self__//Current URL address
Tmpl_file_name//Default template name for current operation (with path) Br>web_public_url//Web site Public directory
App_public_url//Project Common template catalog

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-mode logging
Mail_log=1//Mail logging
tcp_log=2//TCP log logging
file_log=3//File mode logging
Data_type_obj=1//Object mode return
data_type_array=0//Array mode return
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//form exists field is validated
Must_to_validate = 1//Must be verified
Value_to_vailidate = 2//The form value is not NULL to validate

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