Use the configuration class to define the global variables of Codeigniter

Public Functions in CodeIgniter cannot be appended. They can be implemented using helper functions of helper.
Create the common_helper.php file, define the required public functions, and store them in the application/helpers directory.
Configure $ autoload ['helper'] = array ('common'); In application/config/autoload. php.

Global variables can also be implemented using the helper function. However, a more appropriate method may be defined using the configuration class..

By default, CodeIgniter has a master configuration file located in the application/config. php path, which defines a bunch of global framework-level configurations and an array named $ config.

If you need to add a global configuration item, you can implement it in this file. Considering the separation of custom configuration and framework configuration, we recommend that youCreate a file vars. phpAnd then make the following definition:

Copy codeThe Code is as follows :/**
* Working directory Configuration
*/
$ Config ['src'] ['cache'] = FCPATH. '../src/cache ';
$ Config ['src'] ['modules'] = FCPATH. '../src/modules ';
$ Config ['src'] ['www '] = FCPATH.' ../src/www ';
Use the following code to read data from the Controller:

$ Src = $ this-> config-> item ('src ');
$ Cache = $ src ['cache']

Or:

Copy codeThe Code is as follows: $ src = $ this-> config-> item ('cache', 'src ');
Of course, you need to automatically load this configuration file in application/config/autoload. php.