library/Rediska/Key/Set.php
public function intersect($setOrSets, $storeKeyName = null)
    {
        $sets = $this->_prepareSetsForCompare($setOrSets);

        return $this->_getRediskaOn()->intersectSets($sets, $storeKeyName);
    }
public function intersect($setOrSets, $storeKeyName = null)
    {
        $sets = $this->_prepareSetsForCompare($setOrSets);

        return $this->_getRediskaOn()->intersectSets($sets, $storeKeyName);
    }
Return the intersection between the Sets

@param string|Rediska_Key_Set|array $setOrSets    Set key name or object, or array of its
@param string|null                  $storeKeyName Store intersection to set with key name
@return array|boolean