Automatically Apply Parent Page Template To All Sub Pages In WordPress

swich_page_template

 
function switch_page_template() {
    global $post;
    // Checks if current post type is a page, rather than a post
	if (is_page())
	{	
		// Checks if page is parent, if yes, return
		if ($post->post_parent == 0)
			return true;
		else if ($post->post_parent != $post->ID)
		{
			$parent_page_template = get_post_meta($post->post_parent,'_wp_page_template',true);
 
			$template = TEMPLATEPATH . "/{$parent_page_template}";
			if (file_exists($template)) {
				load_template($template);
				exit;
			}
		}
	}
}
 
add_action('template_redirect','switch_page_template');

swich_page_template_subs

//Now this supports sub sub pages… and sub sub sub pages and so on
function switch_page_template() {
global $post;
// Checks if current post type is a page, rather than a post
if (is_page()){
$ancestors = $post->ancestors;

if ($ancestors) {
$parent_page_template = get_post_meta(end($ancestors),'_wp_page_template',true);
$template = TEMPLATEPATH . "/{$parent_page_template}";
if (file_exists($template)) {
load_template($template);
exit;
}
} else {
return true;
}
}
}

add_action('template_redirect','switch_page_template');