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);
          /