code: private function encodeKeyValuePair(string $key, $value, bool $enclose = false): string
      {
          $keyPrefix = ($enclose ? '[' : '');
          $keySuffix = ($enclose ? ']' : '');
          $trueValues = array(true, 'true', 'yes', 'on');
          $falseValues = array(false, 'false', 'no', 'off');
  
          if (is_array($value)) {
              $result = '';
  
              foreach ($value as $k => $v) {
                  $result .= $keyPrefix . $key . $keySuffix;
                  $result .= $this->encodeKeyValuePair($k, $v, true);
              }
  
              return $result;
          } 
  
          if (is_numeric($value)) {
              return $keyPrefix . $key . $keySuffix . ' = ' . $value . PHP_EOL;
          } 
  
          if (is_bool($value)) {
              return $keyPrefix . $key . $keySuffix . ' = ' . ($value ? 'true' : 'false') . PHP_EOL;
          }
  
          return $keyPrefix . $key . $keySuffix . ' = "' . $value . '"' . PHP_EOL;
      }
docs: Encodes the provided $key and $value into a assignment string.
  
  @param string $key
  @param array|string $value
  @param boolean $enclose
  
  @return string