original_string: public function alias($alias = null)
      {
          if ($alias === null) {
              return $this->_alias;
          }
          $this->_alias = $alias;
  
          return $this;
      }
code: public function alias($alias = null)
      {
          if ($alias === null) {
              return $this->_alias;
          }
          $this->_alias = $alias;
  
          return $this;
      }
code_tokens: public function alias ( $ alias = null ) { if ( $ alias === null ) { return $ this -> _alias ; } $ this -> _alias = $ alias ; return $ this ; }
docstring: Get or set the alias.
  
  @param null|string $alias
  @return MenuItem|string
docstring_tokens: Get or set the alias .