original_string: public function setLocalDomain(string $domain): self
      {
          if ('' !== $domain && '[' !== $domain[0]) {
              if (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
                  $domain = '['.$domain.']';
              } elseif (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
                  $domain = '[IPv6:'.$domain.']';
              }
          }
  
          $this->domain = $domain;
  
          return $this;
      }
code: public function setLocalDomain(string $domain): self
      {
          if ('' !== $domain && '[' !== $domain[0]) {
              if (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
                  $domain = '['.$domain.']';
              } elseif (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
                  $domain = '[IPv6:'.$domain.']';
              }
          }
  
          $this->domain = $domain;
  
          return $this;
      }
code_tokens: public function setLocalDomain ( string $ domain ) : self { if ( '' !== $ domain && '[' !== $ domain [ 0 ] ) { if ( filter_var ( $ domain , FILTER_VALIDATE_IP , FILTER_FLAG_IPV4 ) ) { $ domain = '[' . $ domain . ']' ; } elseif ( filter_var ( $ domain , FILTER_VALIDATE_IP , FILTER_FLAG_IPV6 ) ) { $ domain = '[IPv6:' . $ domain . ']' ; } } $ this -> domain = $ domain ; return $ this ; }
docstring: Sets the name of the local domain that will be used in HELO.
  
  This should be a fully-qualified domain name and should be truly the domain
  you're using.
  
  If your server does not have a domain name, use the IP address. This will
  automatically be wrapped in square brackets as described in RFC 5321,
  section 4.1.3.
docstring_tokens: Sets the name of the local domain that will be used in HELO .