docs: def set(self, key, value):
          """
          Updates the value of the given key in the loaded content.
  
          Args:
              key (str): Key of the property to update.
              value (str): New value of the property.
  
          Return:
              bool: Indicates whether or not a change was made.
          """
  
          match = self._get_match(key=key)
  
          if not match:
              self._log.info('"%s" does not exist, so it will be added.', key)
  
              if isinstance(value, str):
                  self._log.info('"%s" will be added as a PHP string value.',
                                 key)
                  value_str = '\'{}\''.format(value)
              else:
                  self._log.info('"%s" will be added as a PHP object value.',
                                 key)
                  value_str = str(value).lower()
  
              new = 'define(\'{key}\', {value});'.format(
                  key=key,
                  value=value_str)
  
              self._log.info('"%s" will be added as: %s', key, new)
  
              replace_this = '<?php\n'
              replace_with = '<?php\n' + new + '\n'
              self._content = self._content.replace(replace_this, replace_with)
              self._log.info('Content string has been updated.')
              return True
  
          if self._get_value_from_match(key=key, match=match) == value:
              self._log.info('"%s" is already up-to-date.', key)
              return False
  
          self._log.info('"%s" exists and will be updated.', key)
  
          start_index = match.start(1)
          end_index = match.end(1)
  
          if isinstance(value, bool):
              value = str(value).lower()
              self._log.info('"%s" will be updated with boolean value: %s',
                             key,
                             value)
          else:
              self._log.info('"%s" will be updated with string value: %s',
                             key,
                             value)
  
          start = self._content[:start_index]
          end = self._content[end_index:]
  
          self._content = start + value + end
          return True