PHP がユーザーの言語に応じて対応する Web ページにジャンプする方法の詳細な説明

<?php 
$lan = substr( $HTTP_ACCEPT_LANGUAGE,0,5); 
if ($lan == "zh-cn") 
print("<meta http-equiv=&#39;refresh&#39; content = &#39;0;URL = gb/index.htm&#39;>"); 
else 
print("<meta http-equiv=&#39;refresh&#39; content = &#39;0;URL = eng/index.htm&#39;>"); 
?>

<script> 
var type=navigator.appName 
if (type=="Netscape") 
var lang = navigator.language 
else 
var lang = navigator.userLanguage 
 
//cut down to first 2 chars of country code 
var lang = lang.substr(0,2) 
 
// 英语 
if (lang == "en") 
window.location.replace(&#39;url&#39;) 
 
// 简体中文 
else if (lang == "zh-cn") 
window.location.replace(&#39;url&#39;) 
 
// 繁体中文 
else if (lang == "zh-tw") 
window.location.replace(&#39;url&#39;) 
 
// 德语 
else if (lang == "de") 
window.location.replace(&#39;url&#39;) 
// 除上面所列的语言 
else 
window.location.replace(&#39;url&#39;) 
 
</script>