template-redirect.php

<?php

/*
Template Name: Page Redirect

 * @author        Dave Stewart
 * @email        dave@davestewart.co.uk
 * @web            www.davestewart.co.uk

 * @name        Page Redirect
 * @type        PHP page
 * @desc        Wordpress template that redirects the current page based on the content of the database entry it loads

 * @requires    Wordpress
 * @install        Copy this file to the directory of the theme you wish to use
 * usage
               1. Create a new Page in your Wordpress control panel
               2. Enter the URL (or local path, relative to your Wordpress directory) you want to redirect to as the only page content
               3. Set the Page Template to "Page Redirect"
               4. Publish
 */

if (function_exists('have_posts') && have_posts()){
    while (have_posts()){

        // get the post
            the_post();

        // get content
            ob_start();
            the_content();
            $contents    = ob_get_contents();
            ob_end_clean();

        // correctly build the link

            // grab the 'naked' link
                $link    = strip_tags($contents);
                $link    = preg_replace('/\s/', '', $link);

            // work out
                if(!preg_match('%^http://%', $link)){
                    $host    = $_SERVER['HTTP_HOST'];
                    $dir    = dirname($_SERVER['PHP_SELF']);
                    $link    = "http://$host$dir/$link";
                    }

            // do the link
                header("Location: $link");
                die('');
                }

    }
?>