Counter::bumpValue
     Counter::bumpValue — 
      Change the current value of a counter.
     
     
    
     Description
     
      void Counter::bumpValue
       ( integer $offset
      )
     
      Counter::bumpValue() updates the current value of a
      counter.
     
     
    
     Parameters
     
      - 
       offset
       
- 
        
         The amount by which to change the counter's value. Can be negative.