Get Google Analytics Data With Incrementor

gistfile1.php

<?php
function zt_get_top_posts( $args, $force = false ) {
	// Define the cache key
	$identifier = md5( maybe_serialize( $args ) );
	$cache_key = 'top-posts-' . $identifier;

	// Define the cache group
	$cache_group = 'zt-ga-data-' . zt_get_incrementor();

	// Attempt to get data from cache
	$top_posts = wp_cache_get( $cache_key, $cache_group );

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

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

		// 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, $cache_group, 3600 );
	}

	return $top_posts;
}

function zt_get_incrementor( $refresh = false ) {
	$incrementor_key = 'google-analytics';
	$incrementor_group = 'zt-incrementors';
	$incrementor_value = wp_cache_get( $incrementor_key, $incrementor_group );	

	if ( false === $incrementor_value || true === $refresh ) {
		$incrementor_value = time();
		wp_cache_set( $incrementor_key, $incrementor_value, $incrementor_group );
	}

	return $incrementor_value;
}