[問題] 如何用PHP判斷是否應該顯示「簡化版」的手機版網頁?
絕大多數大站(如google、facebook)會製作手機版的網頁,但是手機版的網頁又可分「一
般型」的手機版網頁和「簡化版」的手機版網頁,下面的圖例就可以說明「一般型」的手
機版網頁和「簡化版」手機版頁面的差別:
Google:
「一般型」手機版頁面:http://i.imgur.com/DBw7Umn.jpg

「簡化版」手機版頁面:http://i.imgur.com/biVYcni.jpg

Facebook:
「一般型」手機版頁面:http://i.imgur.com/QZCwjnU.jpg

「簡化版」手機版頁面:http://i.imgur.com/cvHdNIO.jpg

我想請問的是,這些網站既然知道使用者是用手持裝置(智慧型手機)來瀏覽本頁面,那
它又是怎樣判斷出應該是要顯示「一般型」的手機版頁面,還是應該顯示「簡化版」的手
機版頁面呢?
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