I have a list of objects:

class Beer {

     var $name;
     var $id;
     var $style;
     var $brewery; 
     var $rate;

     function getName() {
          return $this->name;
     }

     function getID() {
          return $this->id;
     }

     function getStyle() {
          return $this->style;
     }

     function getBrewery() {
          return $this->brewery;
     }

     function getRate() {
          return $this->rate;
     }


}

After doing some research online on how to accomplish this, this is my code:

usort($localBeersList, "cmp");




function cmp($a, $b)
{
    if ($a->getRate() == $b->getRate()) {
        return 0;
    }
    return ($a->getRate() < $b->getRate()) ? -1 : 1;
}

If I try and output my list after this I do not get anything.