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<?php
  apache_setenv("DOCUMENT_ROOT",
		$_SERVER['DOCUMENT_ROOT'] = str_replace($_SERVER['SCRIPT_NAME'], '', $_SERVER['SCRIPT_FILENAME'])
	);
?>

// Note: httpd-vhosts.conf filename just used as an example.

// Add the following line to your apache configuration inside the VirtualDocumentRoot vhost definition
// E.g.
// <VirtualHost *:80>
//     ...
//     {paste here}
// </VirtualHost>

php_admin_value auto_prepend_file "/Users/USERNAME/Sites/setdocroot.php"