Doctrine\Common\Collections\ArrayCollection::get PHP Method

    public function get($key)
    {
        return isset($this->elements[$key]) ? $this->elements[$key] : null;
    }

 public function getParameter($parameter)
 {
     if (!$this->configs instanceof ArrayCollection) {
         $this->generateConfigs($file = 'parameters.yml', null, false);
     }
     return $this->configs->get($parameter);
 }