How to get the client browser name and version by php

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The details are as follows:

See that there is a function get_user_browser () in ecshop that gets the name and version of the browser. Although the information obtained is only simple information, it is still very practical. The principle is that the browser information is obtained through $_ SERVER ['HTTP_USER_AGENT'], and then compared with the rules to get the browser information.

The following is the effect that each browser runs:

The source code is as follows

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