我注意到通过 PHP 的 readfile 或 fpassthru 技术传递的文件从不被浏览器缓存。
我该怎么“鼓励”浏览器缓存通过这些方式提供的项目？
无论您的内容是否被缓存都与readfile（）和类似函数无关，但是服务器可能会发出默认缓存标头（该标头将激活HTML页面和图像资源的缓存），但使用PHP通过文件时不适用。
你们必须寄送适当的头盔和你的内容,告诉浏览器,为这一资源打下一切是正确的。
例如，请看
Web作者和网站管理员的缓存教程
如何使用PHP HTTP缓存标题
最终，我找到了这个页面，并将其用作我自己实现的起点。这个页面上的示例代码以及 Pekka 指向的一些阅读都对我来说是一个很好的跳板。
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