Detailed explanation of sample code for php to download files to local area

Note: This demo is suitable for the yii framework. If you are not using the yii framework, this method is also applicable to you. Just understand the idea briefly

   /**
     * 保存文件到本地
     * @param 文件路径 $url
     * @param 保存本地路径 $savePath
     * @return string
     */
    public static function downloadFile($url) {
        $www_root = Yii::getPathOfAlias('webroot');
        $root_dir = 'uploads/audio';
        $build_dir = date('Y') . '/' . date('m');
        $origin_dir = $root_dir . '/' . $build_dir;
        $savePath = $www_root . DIRECTORY_SEPARATOR . $origin_dir . DIRECTORY_SEPARATOR;// 本地存放的路径（我是按照年月日来划分）
        $fileName = Common::getUrlFileExt($url);                                     // 获取文件扩展名
        if (!file_exists($savePath)) {
            Common::mkdirs($savePath);                                              //目录不存在创建目录
        }
        $fileName = time() . '.' . $fileName;
        //$file = file_get_contents($url);
        $ch = curl_init();
        $timeout = 60;
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        $file_contents = curl_exec($ch);
        curl_close($ch);                                                //使用curl $ch 为返回的文件流
        if (!empty($file_contents)) {
            file_put_contents($savePath . '/' . $fileName, $file_contents);  //保存到本地的地址
            return '/' . $origin_dir . '/' . $fileName;                  //返回本地地址
        }
    }

    /**
     * 获取文件扩展名
     * @param 网页URL $url
     * @return string
     */
    public static function getUrlFileExt($url) {
        $ary = parse_url($url);
        $file = basename($ary['path']);
        $ext = explode('.', $file);
        return $ext[1];
    }

    /**
     * 创建多级目录
     */
    public static function mkdirs($dir) {
        if (!is_dir($dir)) {
            if (!Common::mkdirs(dirname($dir))) {
                return false;
            }
            if (!mkdir($dir, 0777)) {
                return false;
            }
        }
        return true;
    }

downloadFile（http://www.php.cn/）;  // 调用

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