/** * @author default7 * @description 演示php弹出下载的原理 * * @param $file_name */ function downfile($file_name) { $file_path = "/tmp/" . $file_name; $buffer = 102400; //一次返回102400个字节 if (!file_exists($file_path)) { echo "<script type='text/javascript'> alert('对不起!该文件不存在或已被删除!'); </script>"; return; } $fp = fopen($file_path, "r"); $file_size = filesize($file_path); $file_data = ''; while (!feof($fp)) { $file_data .= fread($fp, $buffer); } fclose($fp); //begin writing headers header("pragma: public"); header("expires: 0"); header("cache-control: must-revalidate, post-check=0, pre-check=0"); header("cache-control: public"); header("content-description: file transfer"); header("content-type:application/octet-stream;"); header("accept-ranges:bytes"); header("accept-length:{$file_size}"); header("content-disposition:attachment; filename={$file_name}"); header("content-transfer-encoding: binary"); echo $file_data; }
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