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
            ));
        }
    }
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
            ));
        }
    }
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 ) ) ; } }
Ensures the given filePath is readable.

@throws \InvalidArgumentException
Ensures the given filePath is readable .