Captioning\File::loadFromFile PHP Method

    public function loadFromFile($_filename = null)
    {
        if ($_filename === null) {
            $_filename = $this->filename;
        } else {
            $this->filename = $_filename;
        }
        if (!file_exists($_filename)) {
            throw new \Exception('File "' . $_filename . '" not found.');
        }
        if (!($content = file_get_contents($this->filename))) {
            throw new \Exception('Could not read file content (' . $_filename . ').');
        }
        $this->loadFromString($content);
        return $this;
    }