Read SimplePie cache without opening SimplePie

gistfile1.php

<?php
require('simplepie.inc');

$cache = SimplePie_Cache::create($cache_location, md5($url), 'spc');

// Load data
$data = $cache->load(); // returns instance of SimplePie

// Get timestamp
$time = $cache->mtime(); // returns integer

// Update timestamp
$cache->touch();

// Save a new SimplePie instance
$cache->save($sp); // returns boolean

// Wipe cache
$cache->unlink();