Including PHP file in Joomla [closed]

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I have a logger class that I need to log my application processing. How can I include this file in Joomla, when my file is located in the includes folder. I don't want to always have to include the file using ../../../, because then I have to manually count paths everytime I include my class. Is there any way to generate the line that will include that file relatively?

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You could use the Joomla constants for JPath from here: http://docs.joomla.org/JPath like so:

include_once (JPATH_ROOT.DS.'includes'.DS.'some.class.php');

You can replace JPATH_ROOT with any of the following:

JPATH_SITE 
JPATH_BASE 

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use this every where

<?php
include $_SERVER['DOCUMENT_ROOT']."/lib/sample.lib.php";
?>

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In joomlla 2.5 + never use include_once or require_once to include a class file. PHP has to check if the file has already been loaded before loading the file.

Since joomla 2.5 there is the JLoader::register() method which doesn't use any memory unless you need to execute a method within the class.

http://developer.joomla.org/manual/ch01s04.html