public function makeUse()
    {
        ++$this->used;

        if ($this->count > 0 && $this->count <= $this->used) {
            $this->enabled = false;
        }

        return $this;
    }
public function makeUse()
    {
        ++$this->used;

        if ($this->count > 0 && $this->count <= $this->used) {
            $this->enabled = false;
        }

        return $this;
    }
public function makeUse ( ) { ++ $ this -> used ; if ( $ this -> count > 0 && $ this -> count <= $ this -> used ) { $ this -> enabled = false ; } return $ this ; }
Increment used variable by one, and disables it if there are no more
available units.

@return $this Self object
Increment used variable by one and disables it if there are no more available units .