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PHP Caching Headers

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Mark ChangMark Chang


最近測試平台系統執行速度,老實說測試的有點無力~

總覺得能做的可以做的都做了,但速度就是快不了~

不管是用哪種測速平台測試,都不盡理想。

Google PageSpeed Insights給了我一個方向。

Caching

為什麼要設定Cache?

因為若每次平台開啟都得重新把所有的圖像或框架重新載入一遍那得耗掉多少的網路資源跟時間?

因此,參考了一些Cache的設定,如下:
$seconds_to_cache = 3600;
$ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
header("Expires: $ts");
header("Pragma: cache");
header("Cache-Control: max-age=$seconds_to_cache");

設置快取時間1個小時。

清除快取則是
header("Expires: Mon, 26 Jul 1990 05:00:00 GMT");
header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");


先不管測速平台的測試結果如何~至少我的肉眼是有感受到執行速度似乎真的變快了~

總之,先觀察一段時間。
https://innstory.com/story-PHP_Caching_Headers-1708

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Mark Chang

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