获取顶级域名
function get_domain() {
$host = $_SERVER['HTTP_HOST'];
$host = strtolower($host);
if(strpos($host,'/')!==false){
$parse = @parse_url($host);
$host = $parse['host']; }
$topleveldomaindb=array('com','edu','gov','int','mil','net','org','biz','info','pro','name','museum','coop','aero','xxx','idv','mobi','cc','me'); $str='';
foreach($topleveldomaindb as $v){
$str.=($str ? '|' : '').$v;
}
$matchstr="[^\.]+\.(?:(".$str.")|\w{2}|((".$str.")\.\w{2}))$";
if(preg_match("/".$matchstr."/ies",$host,$matchs)){
$domain=$matchs['0'];
} else{
$domain=$host;
}
return $domain;
}