Some random code from http://softwaremaniacs.org/media/soft/highlight/test.html

random.php

<?php
require_once 'Zend.php';
require_once 'Zend/Uri/Exception.php';
require_once 'Zend/Uri/Http.php';
require_once 'Zend/Uri/Mailto.php';

abstract class Zend_Uri
{

  /**
   * Return a string representation of this URI.
   *
   * @see     getUri()
   * @return  string
   */
  public function __toString()
  {
      return $this->getUri();
  }

  static public function factory($uri = 'http')
  {
      $uri = explode(':', $uri, 2);
      $scheme = strtolower($uri[0]);
      $schemeSpecific = isset($uri[1]) ? $uri[1] : '';

      // Security check: $scheme is used to load a class file,
      // so only alphanumerics are allowed.
      if (!ctype_alnum($scheme)) {
          throw new Zend_Uri_Exception('Illegal scheme');
      }
  }
}