[WordPress] "/about/" というURLにアクセスした時だけ Twenty Ten に切り替える

hardcode_theme_switcher.php

<?php
/*
Plugin Name: Hardcode theme switcher
Plugin URI: http://ja.forums.wordpress.org/topic/13483
Author: Takuro Hishikawa
Version: 0.1
*/

function my_theme_switcher($theme){
	// yes, it's hardcoded!
	if ( $_SERVER['REQUEST_URI'] == '/about/' ) {
		$overrideTheme = wp_get_theme('twentyten');
		if ( $overrideTheme->exists() ) {
			return $overrideTheme['Template'];
		} else {
			return $theme;
		}
	}
	return $theme;
}

add_filter('stylesheet', 'my_theme_switcher', 50);
add_filter('template', 'my_theme_switcher', 50);