What are Joomla Constants

These constants are defined for use in Joomla and extensions:-

JPATH_BASE: The path to the installed Joomla! site, or JPATH_ROOT/administrator if executed from the backend.

JPATH_COMPONENT: The path to the current component being executed.

JPATH_CACHE: The path to the cache folder.

JPATH_COMPONENT_SITE: The path to the site folder of the current component being executed.

JPATH_CONFIGURATION: The path to folder containing the configuration.php file.

JPATH_COMPONENT_ADMINISTRATOR: The path to the administration folder of the current component being executed.

JPATH_INSTALLATION: The path to the installation folder.

JPATH_LIBRARIES: The path to the libraries folder.

JPATH_PLUGINS: The path to the plugins folder.

JPATH_ROOT: The path to the installed Joomla! site.

JPATH_SITE: The path to the installed Joomla! site.

JPATH_THEMES: The path to the templates folder.

JPATH_XMLRPC: The path to the XML-RPC Web service folder.(1.5 only)

These constants are defined in _path_/includes/defines.php except JPATH_BASE which is defined in _path_/index.php.

Note: These paths are the absolute paths of these locations within the file system, NOT the path you'd use in a URL.

For URL paths, try using JURI::base().

Difference between JPATH_SITE, JPATH_ROOT, and JPATH_BASE[edit]

JPATH_SITE is meant to represent the root path of the JSite application, just as JPATH_ADMINISTRATOR is mean to represent the root path of the JAdministrator application.

JPATH_BASE is the root path for the current requested application.... so if you are in the administrator application:

JPATH_BASE == JPATH_ADMINISTRATOR
If you are in the site application:

JPATH_BASE == JPATH_SITE
If you are in the installation application:

JPATH_BASE == JPATH_INSTALLATION.
JPATH_ROOT is the root path for the Joomla install and does not depend upon any application.

 Hope this helped.

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