Wrapper around get_posts that utilizes object caching

get_posts_cached.php

/**
 * Wrapper around get_posts that utilizes object caching
 *
 * @access public
 * @param mixed $args (default: NUL)
 * @param bool $force_refresh (default: false)
 * @return void
 */
function get_posts_cached( $args = NULL, $force_refresh = false ) {
    $cache_incrementor = wp_cache_get( 'get_posts_cached', 'cache_incrementors' );
    if ( !is_numeric( $cache_incrementor ) || true === $force_refresh ) {
        $now = time();
        wp_cache_set( 'get_posts_cached', $now, 'cache_incrementors' );
        $cache_incrementor = $now;
    }
     
    $cache_key = 'get_posts_cached_' . $cache_incrementor . '_' . md5( serialize( $args ) );
    $cache_group = 'get_posts_cached';
     
    $posts = wp_cache_get( $cache_key, $cache_group );
    if ( false === $posts || true === $force_refresh ) {
        $posts = get_posts( $args );
        if ( count( $posts ) < 11 ) // we don't want to cache too much
            wp_cache_set( $cache_key, $posts, $cache_group );
    }
    return $posts;
}
 
 
/**
 * Invalidate get_posts_cached stored values.
 *
 * @access public
 * @return void
 */
function invalidate_get_posts_cache( $post_id ) {
    $args = array( 'include' => array( $post_id ) );
    get_posts_cached( $args, $force_refresh=true );
}
add_action( 'save_post', 'invalidate_get_posts_cache', 1 );