下载远程文件

        return $match;

    }

}

if (!function_exists('download_file')) {

    /**

     * 下载远程文件

     * @param $url 远程文件路径

     * @param null $path 系统保存路径

     * @return string

     */

    function download_file($url, $path = null)

    {

        $filename = trim(pathinfo($url, PATHINFO_FILENAME));

        $ext = strtolower(pathinfo($url, PATHINFO_EXTENSION));

        $filename = "$filename.$ext";

        $root = config('server.settings.document_root', BASE_PATH . '/public');

        $path = $path ? $path : '/download/files';

        $savePath = $root . $path;

        if (!is_dir($savePath)) {

            // 判断路径是否存在,不存在,则创建

            mkdir($savePath, 0777, true);

        }

        $filePath = $savePath . '/' . $filename;

        if (!file_exists($filePath)) {

            $ch = curl_init();

            curl_setopt($ch, CURLOPT_URL, $url);

            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);

            $file = curl_exec($ch);

            curl_close($ch);

            $resource = fopen($filePath, 'a');

            fwrite($resource, $file);

            fclose($resource);

        }

        return $path . '/' . $filename;;

    }

}

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