PHP获取一级域名，可根据URL获取也可根据二级域名获取出
<?
$domain="www.yuanxiblog.cn";
echo get_host($domain);
function get_host($domain=""){
$url = $domain ? $domain : $_SERVER["HTTP_HOST"];
$url=str_replace(['http://','https://','/'],null,$url);
$dual_host = array('aaa.pro','ac.cn','ac.kr','ac.mu','aca.pro','acct.pro','ae.org','ah.cn','ar.com','avocat.pro','bar.pro','biz.ki','biz.pl','bj.cn','br.com','busan.kr','chungbuk.kr','chungnam.kr','club.tw','cn.com','co.ag','co.am','co.at','co.bz','co.cm','co.com','co.gg','co.gl','co.gy','co.il','co.im','co.in','co.je','co.kr','co.lc','co.mg','co.ms','co.mu','co.nl','co.nz','co.uk','co.ve','co.za','com.af','com.ag','com.am','com.ar','com.au','com.br','com.bz','com.cm','com.cn','com.co','com.de','com.ec','com.es','com.gl','com.gr','com.gy','com.hn','com.ht','com.im','com.ki','com.lc','com.lv','com.mg','com.ms','com.mu','com.mx','com.nf','com.pe','com.ph','com.pk','com.pl','com.ps','com.pt','com.ro','com.ru','com.sb','com.sc','com.se','com.sg','com.so','com.tw','com.vc','com.ve','cpa.pro','cq.cn','daegu.kr','daejeon.kr','de.com','ebiz.tw','edu.cn','edu.gl','eng.pro','es.kr','eu.com','fin.ec','firm.in','fj.cn','game.tw','gangwon.kr','gb.com','gb.net','gd.cn','gen.in','go.kr','gov.cn','gr.com','gs.cn','gwangju.kr','gx.cn','gyeongbuk.kr','gyeonggi.kr','gyeongnam.kr','gz.cn','ha.cn','hb.cn','he.cn','hi.cn','hk.cn','hl.cn','hn.cn','hs.kr','hu.com','hu.net','idv.tw','in.net','incheon.kr','ind.in','info.ec','info.ht','info.ki','info.nf','info.pl','info.ve','jeju.kr','jeonbuk.kr','jeonnam.kr','jl.cn','jp.net','jpn.com','js.cn','jur.pro','jx.cn','kg.kr','kiwi.nz','kr.com','law.pro','ln.cn','me.uk','med.ec','med.pro','mex.com','mo.cn','ms.kr','ne.kr','net.af','net.ag','net.am','net.br','net.bz','net.cm','net.cn','net.co','net.ec','net.gg','net.gl','net.gr','net.gy','net.hn','net.ht','net.im','net.in','net.je','net.ki','net.lc','net.lv','net.mg','net.mu','net.my','net.nf','net.nz','net.ph','net.pk','net.pl','net.ps','net.ru','net.sb','net.sc','net.so','net.vc','net.ve','nm.cn','no.com','nom.ag','nom.co','nom.es','nom.ro','nx.cn','or.at','or.jp','or.kr','or.mu','org.af','org.ag','org.am','org.bz','org.cn','org.es','org.gg','org.gl','org.gr','org.hn','org.ht','org.il','org.im','org.in','org.je','org.ki','org.lc','org.lv','org.mg','org.ms','org.mu','org.my','org.nz','org.pk','org.pl','org.ps','org.ro','org.ru','org.sb','org.sc','org.so','org.uk','org.vc','org.ve','pe.kr','pro.ec','qc.com','qh.cn','radio.am','radio.fm','re.kr','recht.pro','ru.com','sa.com','sc.cn','sc.kr','sd.cn','se.com','senet','seoul.kr','sh.cn','sn.cn','sx.cn','tj.cn','tw.cn','uk.com','uk.net','ulsan.kr','us.com','us.org','uy.com','web.ve','xj.cn','xz.cn','yn.cn','za.com','zj.cn');
$url_arr = explode(".", $url);
if (count($url_arr) <= 2) {
$host = $url;
} else {
$last = array_pop($url_arr);
$last_1 = array_pop($url_arr);
$last_2 = array_pop($url_arr);
$host = $last_1.'.'.$last;
if (in_array($host, $dual_host)) {
$host = $last_2.'.'.$last_1.'.'.$last;
}
}
return $host;}
?>
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