How can I refer to $ _SERVER ['DOCUMENT_ROOT'] in the .htaccess file?

Question

How can I reference the document root from the htaccess file?

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Currently

php_value auto_prepend_file  C:/wamp/www/hf_latest_desktop/prepend.php

but I would like

php_value auto_prepend_file  **AUTO_DOC_ROOT**prepend.php

where '** AUTO_DOC_ROOT **' is the root path

Answer 1

You can not. Apache configuration files do not support this.

Answer 2

You do not need to have an absolute path if this file is in PHP include_path