Doctrine\Common\Collections\ArrayCollection::containsKey PHP 메소드

    public function containsKey($key)
    {
        return isset($this->elements[$key]) || array_key_exists($key, $this->elements);
    }

 /**
  * @param string $name
  *
  * @return Blog|null
  */
 public function find($name)
 {
     if ($this->blogs->containsKey($name)) {
         return $this->blogs[$name];
     }
     return null;
 }