Cache Google Analytics Data with Force Argument

gistfile1.php

<?php
function zt_get_top_posts( $force = false ) {
	// Define our cache key
	$cache_key = 'zt-top-posts';

	// Attempt to grab data from cache
	$top_posts = wp_cache_get( $cache_key );

	// If not found in cache or forced, regenerate
	if ( false === $top_posts || true === $force ) {

		// Get posts from GA
		$top_posts = zt_generate_top_posts();

		// If none were found, save a dummy value so the caller knows that
		if ( false === $top_posts )
			$top_posts = 'none-found';

		// Set the result to the cache
		wp_cache_set( $cache_key, $top_posts, 3600 );
	}

	return $top_posts;
}

function zt_refresh_top_posts() {
	return zt_get_top_posts( true );
}