Odtnhj

I have come across this page

https://www.codeigniter.com/user_guide/general/reserved_names.html

Could someone please explain to me what following constants do:

EXT
FCPATH
SELF
BASEPATH
APPPATH

Thanks

These constants are each defined in the index.php page:

/*
 * -------------------------------------------------------------------
 * Now that we know the path, set the main path constants
 * -------------------------------------------------------------------
 */
 // The name of THIS file
 define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));

 // The PHP file extension
 // this global constant is deprecated.
 define('EXT', '.php');

 // Path to the system folder
 define('BASEPATH', str_replace("\", "/", $system_path));

 // Path to the front controller (this file)
 define('FCPATH', str_replace(SELF, '', __FILE__));

 // Name of the "system folder"
 define('SYSDIR', trim(strrchr(trim(BASEPATH, '/'), '/'), '/'));


 // The path to the "application" folder
 if (is_dir($application_folder))
 
 define('APPPATH', $application_folder.'/');
 
 else
 
 if ( ! is_dir(BASEPATH.$application_folder.'/'))
 
 exit("Your application folder path does not appear to be set correctly. Please open the following file and correct this: ".SELF);
 

 define('APPPATH', BASEPATH.$application_folder.'/');
 

Starting at line 196 on https://github.com/EllisLab/CodeIgniter/blob/develop/index.php

You can find its short definition in index.php on the root of your CI folder.

EXT: The PHP file extension
FCPATH: Path to the front controller (this file) (root of CI)
SELF: The name of THIS file (index.php)
BASEPATH: Path to the system folder
APPPATH: The path to the "application" folder

SELF = index.php

Use when you want to include something from your root folder
FCPATH = C:xampphtdocsyour_root_folder

Use when you want to include something from your application folder
APPPATH = C:xampphtdocsyour_root_folderapplication

BASEPATH = C:xampphtdocsyour_root_foldersystem