Check if a WordPress page is "current"

gistfile1.aw

<?php

/**
 * Check if a WordPress page is "current", i.e. it's the current page or the ancestor of a current page
 *
 * @uses is_search()
 * @uses get_post_type()
 * @uses site_url()
 * @uses get_permalink()
 * @uses get_post_type_object()
 * @uses get_permalink()
 * @uses get_option()
 * @param int|object $page The page object or ID
 * @return boolean
 */
function pilau_is_current( $page ) {
	// Never current in a search
	if ( is_search() )
		return false;
	// Initialize
	global $post;
	$current = false;
	$page_id = is_object( $page ) ? $page->ID : $page;
	if ( $post->ID == $page_id || ( is_object( $post ) && property_exists( $post, 'ancestors' ) && is_array( $post->ancestors ) && in_array( $page_id, $post->ancestors ) ) ) {
		$current = true;
	} else if ( get_post_type() != "page" ) {
		// The above does a simple check
		// Need to account for current view being a custom post type or CPT archive
		$page_path = trim( str_replace( site_url(), '', get_permalink( $page_id ) ), '/' );
		if ( get_post_type() != "post" ) {
			$post_type_object = get_post_type_object( get_post_type() );
			$rewrite_slug = $post_type_object->rewrite['slug'];
		} else {
			$rewrite_slug = trim( str_replace( site_url(), '', get_permalink( get_option( 'page_for_posts' ) ) ), '/' );;
		}
		if ( strlen( $rewrite_slug ) >= strlen( $page_path ) && substr( $rewrite_slug, 0, strlen( $page_path ) ) == $page_path )
			$current = true;
	}
	return $current;
}