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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