取得IE地址栏的访问者域名.
$S = 'http://bbs.webjx.com';
$S = parse_url($S);
$S = strtolower($S['host']) ; //取域名部分
//echo $S;
$domain = array('com','cn','name','org','net'); //域名后缀 有新的就扩展这吧
$SS = $S;
$dd = implode('|',$domain);
$SS = preg_replace('/(\.('.$dd.'))*\.('.$dd.')$/iU','',$SS); 把后面的域名后缀部分去掉
$SS = explode('.',$SS);
$SS = array_pop($SS); //取最后的主域名
$SS = substr($S,strrpos($S,$SS)); //加上后缀拼成完成的主域名
echo $SS;
?>
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