Create a view helper for doing plain-text diffs. @0h20

library/Unl/View/Helper/TextDiff.php

+<?php
+
+class Unl_View_Helper_TextDiff extends Zend_View_Helper_Abstract
+{
+    static protected $_diffRenderer;
+
+    public function textDiff($from, $to)
+    {
+        if ($from == $to) {
+            return $from;
+        }
+        if (!self::$_diffRenderer) {
+            Zend_Loader_Autoloader::getInstance()->registerNamespace('Horde_');
+            self::$_diffRenderer = new Horde_Text_Diff_Renderer_Inline();
+        }
+
+        $diff = new Horde_Text_Diff('auto',
+            array(
+                explode(' ', strtr($from, array("\n" => '*NEWLINE*'))),
+                explode(' ', strtr($to,   array("\n" => '*NEWLINE*')))
+            )
+        );
+        $render = new Horde_Text_Diff_Renderer_Inline();
+        return strtr($render->render($diff), array('*NEWLINE*' => '<br/>'));
+    }
+}