public function getPrevious()
    {
        if (false === $this->pointer || !$this->count || 0 == $this->pointer) {
            return null;
        }
        return $this->ids[$this->pointer - 1];
    }
public function getPrevious()
    {
        if (false === $this->pointer || !$this->count || 0 == $this->pointer) {
            return null;
        }
        return $this->ids[$this->pointer - 1];
    }
public function getPrevious ( ) { if ( false === $ this -> pointer || ! $ this -> count || 0 == $ this -> pointer ) { return null ; } return $ this -> ids [ $ this -> pointer - 1 ] ; }
gets the id BEFORE the current entry.

@return null|string
gets the id BEFORE the current entry .