HEAD

将程序中输出的内容，保存成文件给人下载。

header('Content-Disposition: attachment; filename=name.txt');

header('Content-type: application/x-shockwave-flash');

        header('Content-type: audio/mpeg');
        for($i = 0;$i <= 3; $i++) {
            readfile($this->datapath.'sound/'.strtolower($this->code[$i]).'.mp3');
        }

 

强制浏览器端不缓存

header("Expires: -1");
header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
header("Pragma: no-cache");