/**
* 下載文件
* @param $img
* @return string
*/
public function Download($img)
{
    $items = [];
    $names = [];
    if($img)
    {
      //用于前端跳轉(zhuǎn)zip鏈接拼接
      $path_redirect = '/zip/'.date('Ymd');
      //臨時(shí)文件存儲(chǔ)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]);
            }
            $zip->close();
          } else {
            return '';
          }
          //通過(guò)前端js跳轉(zhuǎn)zip地址下載,讓不使用php代碼下載zip文件
          //if (file_exists($zipname)) {
            //拼接附件地址
            //$redirect = 域名.$path_redirect.'/'.$filename;
            //return $redirect;
            //header("Location:".$redirect);
          //}
          //直接寫文件的方式下載到客戶端
          if (file_exists($zipname)) {
            header("Cache-Control: public");
            header("Content-Description: File Transfer");
            header('Content-disposition: attachment; filename=附件.zip'); //文件名
            header("Content-Type: application/zip"); //zip格式的
            header("Content-Transfer-Encoding: binary"); //告訴瀏覽器，這是二進(jìn)制文件
            header('Content-Length: ' . filesize($zipname)); //告訴瀏覽器，文件大小
            @readfile($zipname);
          }
          //刪除臨時(shí)文件
          @unlink($zipname);
        }
      }
      return '';
    }
}
/**
* curl獲取鏈接內(nèi)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;
}
/**
* 保存臨時(shí)文件
* @param $url
* @param $dir
* @param $content
* @return array
*/
public function SaveFile( $url ,$dir , $content)
{
    $fname   = basename($url); //返回路徑中的文件名部分
    $str_name  = pathinfo($fname); //以數(shù)組的形式返回文件路徑的信息
    $extname  = strtolower($str_name['extension']); //把擴(kuò)展名轉(zhuǎn)換成小寫
    $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);