PHP实现打包下载文件的方法示例

/**
* 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) ;
}

$img = [['url'=>'地址url/1.jpg','name'=>'名字']];
download($img);