<?php
require_once "Cache/Lite/File.php";

$options = array(
    'cacheDir' => '/tmp/',
    'masterFile' => '/home/web/config.xml',
    'pearErrorMode' => CACHE_LITE_ERROR_DIE
);
$cache = new Cache_Lite($options);

if ($data = $cache->get('id_of_the_page')) {

    // Cache hit !
    // Content is in $data
    // (...)

} else { 
    
    // No valid cache found (you have to make and save the page)
    // (...)
    
}

?>