Same page links going to Base URL instead of same page anchor

// BaseURL Same-Page-Link Fix
// Version: 1.0
// Author: Paul Bohman
// Last updated: April 17, 2008
// Note: For the sake of consolidation and simplicity (and perhaps a slight improvement in performance),
// this plugin could be combined with any other plugin that uses the OnWebPagePrerender trigger,
// such as the Page TOC Generator

// get the whole page, right before it's rendered to the browser
$source = &$modx->documentOutput;

// syntax to check
$doubleQuote = 'href="#';

// uncomment these lines if you want to check for single quotes or no quotes:
// $singleQuote = "href='#";
// $noQuote = 'href=#';

// here the link is replaced with the full path, plus the anchor reference:
$source = str_replace($doubleQuote, 'href="'.$_SERVER["REQUEST_URI"].'#', $source);

// uncomment these lines if you want to check for single quotes or no quotes:
//$source = str_replace($singleQuote, "href='".$_SERVER["REQUEST_URI"].'#', $source);
//$source = str_replace($noQuote, 'href='.$_SERVER["REQUEST_URI"].'#', $source);