library/Rediska/Zend/Cache/Backend/Redis.php
public function load($id, $doNotTestCacheValidity = false)
    {
        $id = (array) $id;
        foreach ($id as $key){
            $key = $this->_options['storage']['prefix_key'] . $key;
            $this->_getTransactionByKey($key)
                ->getFromHash(
                    $key,
                    self::FIELD_DATA
                );
        }
        $oldSerializaerAdapter = $this->getRediska()->getSerializer()->getAdapter();
        $this->getRediska()->setSerializerAdapter('toString');
        $result = $this->_execTransactions();
        $this->getRediska()->getSerializer()->setAdapter($oldSerializaerAdapter);
        if(count($result) == 1){
            if(null === ($result = array_shift($result))){
                return false;
            } else {
                return $result;
            }
        } else {
            return $result;
        }
    }
public function load($id, $doNotTestCacheValidity = false)
    {
        $id = (array) $id;
        foreach ($id as $key){
            $key = $this->_options['storage']['prefix_key'] . $key;
            $this->_getTransactionByKey($key)
                ->getFromHash(
                    $key,
                    self::FIELD_DATA
                );
        }
        $oldSerializaerAdapter = $this->getRediska()->getSerializer()->getAdapter();
        $this->getRediska()->setSerializerAdapter('toString');
        $result = $this->_execTransactions();
        $this->getRediska()->getSerializer()->setAdapter($oldSerializaerAdapter);
        if(count($result) == 1){
            if(null === ($result = array_shift($result))){
                return false;
            } else {
                return $result;
            }
        } else {
            return $result;
        }
    }
Load value with given id from cache

@param  string  $id                     Cache id
@param  boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
@return string|false cached datas