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Automatically identify the browser language and switch between Chinese and English (php and Js versions)

error_reporting(E_ALL ^ E_NOTICE);
// Analyze the attributes of HTTP_ACCEPT_LANGUAGE
// Only the first language setting is taken here (other functions can be enhanced as needed)
//Search and organize bbs.it -home.org
preg_match('/^([a-z-]+)/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $matches);
$lang = $matches[1];
switch ($lang) {
case 'zh-cn' :
header('Location: http://cn.jbxue.com/');
break;
case 'zh-tw' :
header('Location: http://tw. jbxue.com/');
break;
case 'ko' :
header('Location: http://ko.jbxue.com/');
break;
default:
header('Location: http:/ /en.jbxue.com/');
break;
}
?>

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2, JS-based method: