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$obCache = new CPHPCache; 
if ($obCache->InitCache($arParams['CACHE_TIME'], $cache_id, $cache_path))
{
   $vars = $obCache->GetVars();
   foreach ($vars as $key => $value)
      $arResult[$key] = $value; 
}
elseif ($obCache->StartDataCache())
{
   getComments(); // рекурсивная функция, заполняющая массив

   $arResult['COMMENTS'] = $comments; // получение массива записей

   $obCache->EndDataCache(array(
      'COMMENTS' => $arResult['COMMENTS'],
   ));
}

$this->IncludeComponentTemplate(); 

$cache_id = serialize(array($arParams['OBJECT_ID'], $GLOBALS['USER']->IsAdmin()));
$cache_path = SITE_ID.'/'.str_replace(':', '/', $this->GetName());

$uniq_str1 = serialize(array($arParams['OBJECT_ID'], true));

CPHPCache::Clean($uniq_str1, $cache_path);     
CPHPCache::Clean($cache_id, $cache_path);       

 $obCache = new CPHPCache; 
if ($obCache->InitCache($arParams['CACHE_TIME'], $cache_id, $cache_path))
{
   $vars = $obCache->GetVars();
   foreach ($vars as $key => $value)
      $arResult[$key] = $value;
   $obCache->Output();
   
   
}
elseif ($obCache->StartDataCache())
{
    
   getComments();
    
    $arResult['COMMENTS'] = $comments;
    
    $this->IncludeComponentTemplate();
    
    $obCache->EndDataCache(array("arResult" => $arResult));
    
}

$uniq_str1 = serialize(array($arParams['OBJECT_ID'], true));
$uniq_str2 = serialize(array($arParams['OBJECT_ID'], false));
CPHPCache::Clean($uniq_str1, $cache_path);   // кеш админов
CPHPCache::Clean($uniq_str2, $cache_path);    // кеш остальных