How does PHP determine the user's browser type and language

How does PHP determine the user's browser type and language_PHP Tutorial

WBOY

Release： 2016-07-13 10:33:00

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It is actually very simple to use PHP to determine the browser type. Because the browser will first send some content containing its own information (browser type, language, etc.) when connecting to the server.

Here we mainly analyze _SERVER["HTTP_USER_AGENT"] (browser type) and _SERVER["HTTP_ACCEPT_LANGUAGE"] (browser language). All we have to do is read these contents and compare them using strpos or preg_match function.

<?php
if(strpos($_SERVER["HTTP_USER_AGENT"],"MSIE 8.0"))  
echo "Internet Explorer 8.0";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"MSIE 7.0"))  
echo "Internet Explorer 7.0";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"MSIE 6.0"))  
echo "Internet Explorer 6.0";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"Firefox/3"))  
echo "Firefox 3";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"Firefox/2"))  
echo "Firefox 2";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"Chrome"))  
echo "Google Chrome";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"Safari"))  
echo "Safari";  
else if(strpos($_SERVER["HTTP_USER_AGENT"],"Opera"))  
echo "Opera";  
else echo $_SERVER["HTTP_USER_AGENT"];  
?>

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The specific procedure to determine the browser language is as follows:

<?php
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 4); //只取前4位，这样只判断最优先的语言。如果取前5位，可能出现en,zh的情况，影响判断。  
if (preg_match("/zh-c/i", $lang))  
echo "简体中文";  
else if (preg_match("/zh/i", $lang))  
echo "繁體中文";  
else if (preg_match("/en/i", $lang))  
echo "English";  
else if (preg_match("/fr/i", $lang))  
echo "French";  
else if (preg_match("/de/i", $lang))  
echo "German";  
else if (preg_match("/jp/i", $lang))  
echo "Japanese";  
else if (preg_match("/ko/i", $lang))  
echo "Korean";  
else if (preg_match("/es/i", $lang))  
echo "Spanish";  
else if (preg_match("/sv/i", $lang))  
echo "Swedish";  
else echo $_SERVER["HTTP_ACCEPT_LANGUAGE"];  
?>

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Summary: Determining the browser type mainly relies on analyzing the content of _SERVER["HTTP_USER_AGENT"], while analyzing the browser language is analyzing _SERVER["HTTP_ACCEPT_LANGUAGE"].