$_SERVER['REDIRECT_URL']

<?php

// The deal is to get the requested bad page,
// do a search for a matching page in any case,
// and redirect to it.

// Get the offending page
$badURL = $_SERVER['REDIRECT_URL'];

// Get rid of the first slash
$badURL = substr($badURL, 1, strlen($badURL) - 1);

// Get rid of any trailing slash
if (substr($badURL, strlen($badURL) - 1, 1) == '/')
    $badURL = substr($badURL, 0, strlen($badURL) - 1);

// Split the URL into an array
$badList = explode('/', $badURL);

// Create an array
$top = count($badList);

// Get the current base directory
$currentDir = getcwd();

// We want to store a variable that will be the actual path
// to the found file, if we in fact find a file.
$desiredPath = '/';

// Loop
for ($i = 0; $i < $top; $i += 1)
{
    // If it's less, then we are in a folder
    if ($i < $top - 1)
    {
        // We want to get all the folders in $currentDir
        // using the opendir function
        $dir_handle = @opendir($currentDir) or die("Unable to open $currentDir");

        // Get the current index
        while ($folder = readdir($dir_handle))
        {
            // Make sure it's a Folder and it's a match
            if (is_dir($folder) && strcasecmp($folder, $badList[$i]) == 0)
            {
                // It's a match.  Append the real folder to 
                // the $desiredPath variable
                $desiredPath .= $folder . '/';
                $currentDir .= '/' . $folder;
                break;
            }
        }    

          // Close the open directory
        closedir($dir_handle);
    }
    else
    {    
        // Look for the matching file or folder (if it's a request without a 
        // specific file) in $currentDir
        $dir_handle = @opendir($currentDir);

        // Do the file loop
        while ($fileOrFolder = readdir($dir_handle))
        {
            // See if it's a match
            if (strcasecmp($fileOrFolder, $badList[$i]) == 0)
            {
                // Ladies and Gentlemen, we have a match
                $desiredPath .= $fileOrFolder;
                closeDir($dir_handle);
                header("Location: $desiredPath");
            }
        }

        // We're not gonna find it.  Close
        // the file handle.
        closeDir($dir_handle);
    }
}

// If we get to this point, we're boned.
?>

404 Error Text Here if no redirect.