original_string: private static function isValidAuthHost(string $host): bool
      {
          if ($host === '') {
              return true;
          }
  
          // http://tools.ietf.org/html/rfc3986#section-3.2.2
          // A host identified by an Internet Protocol literal address, version 6
          // [RFC3513] or later, is distinguished by enclosing the IP literal
          // within square brackets ("[" and "]").  This is the only place where
          // square bracket characters are allowed in the URI syntax.
          if (strpos($host, '[') !== false) {
              return self::isValidIpLiteral($host);
          }
  
          // IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
          $dec = '(?:(?:2[0-4]|1[0-9]|[1-9])?[0-9]|25[0-5])';
          $ipV4 = sprintf('/\A(?:%s\.){3}%s\z/', $dec, $dec);
          if (preg_match($ipV4, $host)) {
              return true;
          }
  
          // reg-name = *( unreserved / pct-encoded / sub-delims )
          $pattern = sprintf(
              '/\A(?:[%s%s]|(?:%s))*\z/i',
              'a-z0-9\-._~',
              '!$&\'()*+,;=',
              '%[a-f0-9]{2}'
          );
  
          return !!preg_match($pattern, $host);
      }
code: private static function isValidAuthHost(string $host): bool
      {
          if ($host === '') {
              return true;
          }
  
          // http://tools.ietf.org/html/rfc3986#section-3.2.2
          // A host identified by an Internet Protocol literal address, version 6
          // [RFC3513] or later, is distinguished by enclosing the IP literal
          // within square brackets ("[" and "]").  This is the only place where
          // square bracket characters are allowed in the URI syntax.
          if (strpos($host, '[') !== false) {
              return self::isValidIpLiteral($host);
          }
  
          // IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
          $dec = '(?:(?:2[0-4]|1[0-9]|[1-9])?[0-9]|25[0-5])';
          $ipV4 = sprintf('/\A(?:%s\.){3}%s\z/', $dec, $dec);
          if (preg_match($ipV4, $host)) {
              return true;
          }
  
          // reg-name = *( unreserved / pct-encoded / sub-delims )
          $pattern = sprintf(
              '/\A(?:[%s%s]|(?:%s))*\z/i',
              'a-z0-9\-._~',
              '!$&\'()*+,;=',
              '%[a-f0-9]{2}'
          );
  
          return !!preg_match($pattern, $host);
      }
code_tokens: private static function isValidAuthHost ( string $ host ) : bool { if ( $ host === '' ) { return true ; } // http://tools.ietf.org/html/rfc3986#section-3.2.2 // A host identified by an Internet Protocol literal address, version 6 // [RFC3513] or later, is distinguished by enclosing the IP literal // within square brackets ("[" and "]").  This is the only place where // square bracket characters are allowed in the URI syntax. if ( strpos ( $ host , '[' ) !== false ) { return self :: isValidIpLiteral ( $ host ) ; } // IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet $ dec = '(?:(?:2[0-4]|1[0-9]|[1-9])?[0-9]|25[0-5])' ; $ ipV4 = sprintf ( '/\A(?:%s\.){3}%s\z/' , $ dec , $ dec ) ; if ( preg_match ( $ ipV4 , $ host ) ) { return true ; } // reg-name = *( unreserved / pct-encoded / sub-delims ) $ pattern = sprintf ( '/\A(?:[%s%s]|(?:%s))*\z/i' , 'a-z0-9\-._~' , '!$&\'()*+,;=' , '%[a-f0-9]{2}' ) ; return ! ! preg_match ( $ pattern , $ host ) ; }
docstring: Checks if authority host is valid
  
  @param string $host The host
  
  @return bool
docstring_tokens: Checks if authority host is valid