src/Console/BaseCommand.php
protected function validateFile($filePath, $message = 'File', $allowEmpty = true)
    {
        if (! file_exists($filePath) || ! is_readable($filePath)) {
            throw new \RuntimeException("$message '{$filePath}' doesn't exist or is not readable.");
        }

        if (! $allowEmpty && 0 === filesize($filePath)) {
            throw new \RuntimeException("$message '{$filePath}' is empty.");
        }

        return realpath($filePath);
    }
protected function validateFile($filePath, $message = 'File', $allowEmpty = true)
    {
        if (! file_exists($filePath) || ! is_readable($filePath)) {
            throw new \RuntimeException("$message '{$filePath}' doesn't exist or is not readable.");
        }

        if (! $allowEmpty && 0 === filesize($filePath)) {
            throw new \RuntimeException("$message '{$filePath}' is empty.");
        }

        return realpath($filePath);
    }
Validates the file exists, is readable and optionaly is not empty
and returns an absolute path to the file.

@param $filePath
@param string $message

@return string