Returns $DOCUMENT_ROOT or, if undefined, calculates it before returning.

By : Matt

<?php
/**
* Returns $DOCUMENT_ROOT or, if undefined, calculates it before returning.
*
* Normally we can find out the topmost physical directory of our site by
* reading the DOCUMENT_ROOT environment variable. But not all web servers
* define this (at least IIS doesn't) and we have to find the directory
* on our own.
*
* @return returns the physical path to the site's topmost directory
* @sidefx sets the global variable $DOCUMENT_ROOT if it was undefined
* @author Dirk Makowski, 2002-01-15
*/
function getDocumentRoot()
{
global $DOCUMENT_ROOT, $PATH_TRANSLATED, $PATH_INFO;
if ( !isset($DOCUMENT_ROOT) ) {
// Check if we have $PATH_TRANSLATED and $PATH_INFO. We need them!
if ( isset($PATH_TRANSLATED) && isset($PATH_INFO) ) {
// In $PATH_TRANSLATED dirs are separated by escaped backslashes
// (`\\') ,in $PATH_INFO in Unix style by slashes (`/'). So we
// convert the former to the latter.
$pt = str_replace("\\\\", "/", $PATH_TRANSLATED);
// Now we cut off $PATH_INFO from $PATH_TRANSLATED's tail
// and get the physical path to the topmost dir of the site.
$l = strlen($pt) - strlen($PATH_INFO);
$DOCUMENT_ROOT = substr($pt, 0, $l);
}
// is there an else?
}
return $DOCUMENT_ROOT;
}
?>

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