libs/internals/core.write_cache_file.php

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<?php
/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */

/**
 * Prepend the cache information to the cache file
 * and write it
 *
 * @param string $tpl_file
 * @param string $cache_id
 * @param string $compile_id
 * @param string $results
 * @return true|null
 */

 // $tpl_file, $cache_id, $compile_id, $results

function smarty_core_write_cache_file($params, &$smarty)
{

    // put timestamp in cache header
    $smarty->_cache_info['timestamp'] = time();
    if ($smarty->cache_lifetime > -1){
        // expiration set
        $smarty->_cache_info['expires'] = $smarty->_cache_info['timestamp'] + $smarty->cache_lifetime;
    } else {
        // cache will never expire
        $smarty->_cache_info['expires'] = -1;
    }

    // collapse nocache.../nocache-tags
    if (preg_match_all('!\{(/?)nocache\:[0-9a-f]{32}#\d+\}!', $params['results'], $match, PREG_PATTERN_ORDER)) {
        // remove everything between every pair of outermost noache.../nocache-tags
        // and replace it by a single nocache-tag
        // this new nocache-tag will be replaced by dynamic contents in
        // smarty_core_process_compiled_includes() on a cache-read
        
        $match_count = count($match[0]);
        $results = preg_split('!(\{/?nocache\:[0-9a-f]{32}#\d+\})!', $params['results'], -1, PREG_SPLIT_DELIM_CAPTURE);
        
        $level = 0;
        $j = 0;
        for ($i=0, $results_count = count($results); $i < $results_count && $j < $match_count; $i++) {
            if ($results[$i] == $match[0][$j]) {
                // nocache tag
                if ($match[1][$j]) { // closing tag
                    $level--;
                    unset($results[$i]);
                } else { // opening tag
                    if ($level++ > 0) unset($results[$i]);
                }
                $j++;
            } elseif ($level > 0) {
                unset($results[$i]);
            }
        }
        $params['results'] = implode('', $results);