original_string: public function docType($type = 'html5')
      {
          if (isset($this->_docTypes[$type])) {
              return $this->_docTypes[$type];
          }
  
          return null;
      }
code: public function docType($type = 'html5')
      {
          if (isset($this->_docTypes[$type])) {
              return $this->_docTypes[$type];
          }
  
          return null;
      }
code_tokens: public function docType ( $ type = 'html5' ) { if ( isset ( $ this -> _docTypes [ $ type ] ) ) { return $ this -> _docTypes [ $ type ] ; } return null ; }
docstring: Returns a doctype string.
  
  Possible doctypes:
  
  - html4-strict:  HTML4 Strict.
  - html4-trans:  HTML4 Transitional.
  - html4-frame:  HTML4 Frameset.
  - html5: HTML5. Default value.
  - xhtml-strict: XHTML1 Strict.
  - xhtml-trans: XHTML1 Transitional.
  - xhtml-frame: XHTML1 Frameset.
  - xhtml11: XHTML1.1.
  
  @param string $type Doctype to use.
  @return string|null Doctype string
  @link https://book.cakephp.org/3.0/en/views/helpers/html.html#creating-doctype-tags
docstring_tokens: Returns a doctype string .