Cache_Lite::get()

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

$options = array(
    'cacheDir' => '/tmp/',
    'lifeTime' => 7200,
    'pearErrorMode' => CACHE_LITE_ERROR_DIE
);
$cache = Cache_Lite($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)
    // (...)
    
}

?>