original_string: protected function filter($input): string
      {
          $input = parent::filter((string)$input);
          return preg_replace('/\s/', '', $input);
      }
code: protected function filter($input): string
      {
          $input = parent::filter((string)$input);
          return preg_replace('/\s/', '', $input);
      }
code_tokens: protected function filter ( $ input ) : string { $ input = parent :: filter ( ( string ) $ input ) ; return preg_replace ( '/\s/' , '' , $ input ) ; }
docstring: Filter input data
  
  @param  string $input
  
  @return string
docstring_tokens: Filter input data