(PECL sphinx >= 0.1.0)
SphinxClient::setFilterRange — Add new integer range filter
$attribute
   , int $min
   , int $max
   [, bool $exclude = FALSE
  ] ) : bool
   Adds new integer range filter to the existing list of filters.
   Only those documents which have attribute 
   value stored in the index between min and
   max (including values that are exactly equal 
   to min or max) will 
   be matched (or rejected, if exclude is TRUE).
  
attributeAn attribute name.
minMinimum value.
maxMaximum value.
exclude
       If set to TRUE, matching documents are excluded from the result set.
      
   成功时返回 TRUE, 或者在失败时返回 FALSE。