[WordPress] "/about/", "/news/", "/blog/" というURLにアクセスした時にテーマを切り替える

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($theme){
	// yes, it's hardcoded!
	switch (preg_replace('#^/([^/]+)/?.*$#', '$1', $_SERVER['REQUEST_URI'])) {
	case 'about':
		$overrideTheme = 'twentyten';
		break;
	case 'news':
		$overrideTheme = 'twentyeleven';
		break;
	case 'blog':
		$overrideTheme = 'twentytwelve';
		break;
	default:
		$overrideTheme = false;
	}

	if ( $overrideTheme ) {
		$overrideTheme = wp_get_theme($overrideTheme);
		return $overrideTheme->exists()
			? $overrideTheme['Template']
			: $theme;
	}
	return $theme;
}

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