If you want to redirect a page with PHP simple create a blank PHP file (example.php) and only include the following line:

<?php
header( ‘Location: http://www.example.com/new_page.html’ ) ;
?>

If you want to redirect an entire directory simply name this file index.php

NOTE: If you want a permanent redirect because you have moved your website and wish to keep your linkbacks from google and other search-engines and sites, follow the directions here.