(PECL sphinx >= 0.1.0)
SphinxClient::setFilterFloatRange — Add new float range filter
$attribute
   , float $min
   , float $max
   [, bool $exclude = false
  ] )
   Adds new float 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).
  
attribute
     An attribute name.
min
     Minimum value.
max
     Maximum value.
exclude
     
       If set to TRUE, matching documents are excluded from the result set.
      
   Returns TRUE on success or FALSE on failure.