php打包下载文件

/**
     * 下载文件
     * @param $img
     * @return string
     */
    public function Download($img)
    {
        $items = [];
        $names = [];
        if($img)
        {
            //用于前端跳转zip链接拼接
            $path_redirect  = "/zip/".date("Ymd");
            //临时文件存储地址
            $path           = "/tmp".$path_redirect;
            if(!is_dir($path))
            {
                mkdir($path, 0777,true);
            }
            foreach ($img as $key => $value) {
                $fileContent = "";
                $fileContent = $this->CurlDownload($value["url"]);
                if( $fileContent )
                {
                    $__tmp = $this->SaveFile( $value["url"] , $path , $fileContent );
                    $items[] = $__tmp[0];
                    $names[] = $value["name"]."_".($key+1).".".$__tmp[1];
                }
            }

            if( $items )
            {
                $zip = new ZipArchive();
                $filename = time()."download.zip";
                $zipname = $path."/".$filename;

                if (!file_exists($zipname)) {
                    $res = $zip->open($zipname, ZipArchive::CREATE | ZipArchive::OVERWRITE);
                    if ($res) {
                        foreach ($items as $k => $v) {
                            $value  = explode("/", $v);
                            $end    = end($value);
                            $zip->addFile($v, $end);
                            $zip->renameName($end, $names[$k]);
                        }
                        $zip->close();
                    } else {
                        return "";
                    }

                    //通过前端js跳转zip地址下载,让不使用php代码下载zip文件
                    //if (file_exists($zipname)) {
                        //拼接附件地址
                        //$redirect = 域名.$path_redirect."/".$filename;
                        //return $redirect;
                        //header("Location:".$redirect);
                    //}

                    //直接写文件的方式下载到客户端
                    if (file_exists($zipname)) {
                        header("Cache-Control: public");
                        header("Content-Description: File Transfer");
                        header("Content-disposition: attachment; filename=附件.zip"); //文件名
                        header("Content-Type: application/zip"); //zip格式的
                        header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件
                        header("Content-Length: " . filesize($zipname)); //告诉浏览器，文件大小
                        @readfile($zipname);
                    }

                    //删除临时文件
                    @unlink($zipname);
                }
            }
            return "";
        }
    }

    /**
     * curl获取链接内容
     * @param $url
     * @return mixed|string
     */
    public function CurlDownload($url) {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $errno 		= curl_errno($ch);
        $error 		= curl_error($ch);
        $res=curl_exec($ch);
        curl_close($ch);
        if($errno>0){
            return "";
        }
        return $res;
    }

    /**
     * 保存临时文件
     * @param $url
     * @param $dir
     * @param $content
     * @return array
     */
    public function SaveFile( $url ,$dir , $content)
    {
        $fname      = basename($url); //返回路径中的文件名部分
        $str_name   = pathinfo($fname);  //以数组的形式返回文件路径的信息
        $extname    = strtolower($str_name["extension"]); //把扩展名转换成小写
        $path       = $dir."/".md5($url).$extname;
        $fp         = fopen( $path ,"w+" );
        fwrite( $fp , $content );
        fclose($fp);
        return array( $path , $extname) ;
    }
    

    引用：
	$img = [["url"=>"地址url/1.jpg","name"=>"名字"]];
	Download($img);