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How to find Joomla root directory

How to find out Joomla root directory for use in files? I tried the following with no luck:

    $path = JPATH_COMPONENT; 
    //Gives component root

    $path = JURI::root();
    //Gives absolute path, can't be used for some reason (http://www.site.com)

    $path = $_SERVER['DOCUMENT_ROOT'];
    //Gives public_html folder, but if someone installs joomla in a directory and not in root, it wrecks the whole thing

Is there a way to find only the root Joomla site? Thank.

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2 answers

maybe this can help you http://docs.joomla.org/Constants

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Suppose you want to include an image from an image folder, you can just use this:

$image = JUri::root() . 'images/image_name.png';

JUri::root()and both JUri::site()always determine the root directory

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