Memcached::getByKey(PECL memcached >= 0.1.0) Memcached::getByKey — Retrieve an item from a specific server Описание
   public mixed Memcached::getByKey
    ( string $server_key
   , string $key
   [, callback $cache_cb
   [, float &$cas_token
  ]] ) 
  Memcached::getByKey() is functionally equivalent to Memcached::get(), except that the free-form server_key can be used to map the key to a specific server. Список параметров
 
 Возвращаемые значенияReturns the value stored in the cache or FALSE otherwise. The Memcached::getResultCode() will return Memcached::RES_NOTFOUND if the key does not exist. Смотрите также
 
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