original_string: public function getProxyAuth()
      {
          $proxy_options = $this->getOption(EnumRequestOption::PROXY_OPTIONS, []);
          return isset($proxy_options[EnumProxyOption::PROXY_AUTH]) ? $proxy_options[EnumProxyOption::PROXY_AUTH] : null;
      }
code: public function getProxyAuth()
      {
          $proxy_options = $this->getOption(EnumRequestOption::PROXY_OPTIONS, []);
          return isset($proxy_options[EnumProxyOption::PROXY_AUTH]) ? $proxy_options[EnumProxyOption::PROXY_AUTH] : null;
      }
code_tokens: public function getProxyAuth ( ) { $ proxy_options = $ this -> getOption ( EnumRequestOption :: PROXY_OPTIONS , [ ] ) ; return isset ( $ proxy_options [ EnumProxyOption :: PROXY_AUTH ] ) ? $ proxy_options [ EnumProxyOption :: PROXY_AUTH ] : null ; }
docstring: Returns proxy auth
  
  available values:
  
  'basic' for BASIC auth
  null or empty('') for no auth
  
  @return string
docstring_tokens: Returns proxy auth