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);