$filename = date ( 'YmdH' ) . ".zip";

// 生成文件

$zip = new \ZipArchive ();

// 使用本类，linux需开启zlib，windows需取消php_zip.dll前的注释

if ($zip->open ($filename ,\ZipArchive::OVERWRITE) !== true) {

//OVERWRITE 参数会覆写压缩包的文件 文件必须已经存在

if($zip->open ($filename ,\ZipArchive::CREATE) !== true){

// 文件不存在则生成一个新的文件 用CREATE打开文件会追加内容至zip

exit ( '无法打开文件，或者文件创建失败' );

}

}

foreach ($imageData as $key =>$file) {        $ch = curl_init();        curl_setopt($ch, CURLOPT_POST, 0);        curl_setopt($ch,CURLOPT_URL,$file);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);        $fileContent = curl_exec($ch);        curl_close($ch);        $info = pathinfo($file);        $zip->addFromString(basename($key.'.'.$info['extension']), $fileContent);    }    $zip->close();    //var_dump($filename);    if(file_exists($filename)){        ob_end_clean();        header('Content-Description: File Download');        header('Content-type: application.octet-stream');        header('Content-Disposition: attachment; filename='.basename($filename));        header('Content-Transfer-Encoding: binary');        header('Expires: 0');        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');        header('Pragma: public');        header('Content-Length: ' . filesize($filename));        readfile($filename);        exit;    }