original_string: protected function ensureFileIsReadable()
      {
          $filePath = $this->filePath;
          if (!is_readable($filePath) || !is_file($filePath)) {
              throw new InvalidArgumentException(sprintf(
                  'Dotenv: Environment file .env not found or not readable. '.
                  'Create file with your environment settings at %s',
                  $filePath
              ));
          }
      }
code: protected function ensureFileIsReadable()
      {
          $filePath = $this->filePath;
          if (!is_readable($filePath) || !is_file($filePath)) {
              throw new InvalidArgumentException(sprintf(
                  'Dotenv: Environment file .env not found or not readable. '.
                  'Create file with your environment settings at %s',
                  $filePath
              ));
          }
      }
code_tokens: protected function ensureFileIsReadable ( ) { $ filePath = $ this -> filePath ; if ( ! is_readable ( $ filePath ) || ! is_file ( $ filePath ) ) { throw new InvalidArgumentException ( sprintf ( 'Dotenv: Environment file .env not found or not readable. ' . 'Create file with your environment settings at %s' , $ filePath ) ) ; } }
docstring: Ensures the given filePath is readable.
  
  @throws \InvalidArgumentException
docstring_tokens: Ensures the given filePath is readable .