src/ContainerNamespace.php
protected function getCodeFromFile(string $containerFilePath) : string
    {
        if (!file_exists($containerFilePath) || !is_readable($containerFilePath))
        {
            throw new ContainerNamespaceException("The file '" . $containerFilePath . "' is not readable or does not exist.");
        }

        return file_get_contents($containerFilePath);
    }
protected function getCodeFromFile(string $containerFilePath) : string
    {
        if (!file_exists($containerFilePath) || !is_readable($containerFilePath))
        {
            throw new ContainerNamespaceException("The file '" . $containerFilePath . "' is not readable or does not exist.");
        }

        return file_get_contents($containerFilePath);
    }
Simply returns the contents of the given file

@param return string         $containerFilePath The path to a container file.
@return string