PHP implements extracting root domain name through URL

This article shares with you what I encountered when I was working on a project. I need to use PHP to extract the root domain name from the URL and the implementation ideas. Friends in need can refer to

PHP Extract the root domain name based on the URL. I use it in my personal work. Since many codes on the Internet cannot get the correct results, I wrote one myself. Everyone is welcome to use it and report bugs.

<?php 
#使用示例
echo getBaseDomain(&#39;http://blog.jp.goo.ne.jp/index.php&#39;)->domain;echo "\n";
echo getBaseDomain(&#39;http://51.ca/index.php&#39;)->domain;echo "\n";
echo getBaseDomain(&#39;http://blog.ab.cc.win.aisa.hk/index.php&#39;)->domain;echo "\n";
 
 
function getBaseDomain($url=&#39;&#39;){
  if(!$url){
    return $url;
  }
  #列举域名中固定元素
  $state_domain = array(
    &#39;al&#39;,&#39;dz&#39;,&#39;af&#39;,&#39;ar&#39;,&#39;ae&#39;,&#39;aw&#39;,&#39;om&#39;,&#39;az&#39;,&#39;eg&#39;,&#39;et&#39;,&#39;ie&#39;,&#39;ee&#39;,&#39;ad&#39;,&#39;ao&#39;,&#39;ai&#39;,&#39;ag&#39;,&#39;at&#39;,&#39;au&#39;,&#39;mo&#39;,&#39;bb&#39;,&#39;pg&#39;,&#39;bs&#39;,&#39;pk&#39;,&#39;py&#39;,&#39;ps&#39;,&#39;bh&#39;,&#39;pa&#39;,&#39;br&#39;,&#39;by&#39;,&#39;bm&#39;,&#39;bg&#39;,&#39;mp&#39;,&#39;bj&#39;,&#39;be&#39;,&#39;is&#39;,&#39;pr&#39;,&#39;ba&#39;,&#39;pl&#39;,&#39;bo&#39;,&#39;bz&#39;,&#39;bw&#39;,&#39;bt&#39;,&#39;bf&#39;,&#39;bi&#39;,&#39;bv&#39;,&#39;kp&#39;,&#39;gq&#39;,&#39;dk&#39;,&#39;de&#39;,&#39;tl&#39;,&#39;tp&#39;,&#39;tg&#39;,&#39;dm&#39;,&#39;do&#39;,&#39;ru&#39;,&#39;ec&#39;,&#39;er&#39;,&#39;fr&#39;,&#39;fo&#39;,&#39;pf&#39;,&#39;gf&#39;,&#39;tf&#39;,&#39;va&#39;,&#39;ph&#39;,&#39;fj&#39;,&#39;fi&#39;,&#39;cv&#39;,&#39;fk&#39;,&#39;gm&#39;,&#39;cg&#39;,&#39;cd&#39;,&#39;co&#39;,&#39;cr&#39;,&#39;gg&#39;,&#39;gd&#39;,&#39;gl&#39;,&#39;ge&#39;,&#39;cu&#39;,&#39;gp&#39;,&#39;gu&#39;,&#39;gy&#39;,&#39;kz&#39;,&#39;ht&#39;,&#39;kr&#39;,&#39;nl&#39;,&#39;an&#39;,&#39;hm&#39;,&#39;hn&#39;,&#39;ki&#39;,&#39;dj&#39;,&#39;kg&#39;,&#39;gn&#39;,&#39;gw&#39;,&#39;ca&#39;,&#39;gh&#39;,&#39;ga&#39;,&#39;kh&#39;,&#39;cz&#39;,&#39;zw&#39;,&#39;cm&#39;,&#39;qa&#39;,&#39;ky&#39;,&#39;km&#39;,&#39;ci&#39;,&#39;kw&#39;,&#39;cc&#39;,&#39;hr&#39;,&#39;ke&#39;,&#39;ck&#39;,&#39;lv&#39;,&#39;ls&#39;,&#39;la&#39;,&#39;lb&#39;,&#39;lt&#39;,&#39;lr&#39;,&#39;ly&#39;,&#39;li&#39;,&#39;re&#39;,&#39;lu&#39;,&#39;rw&#39;,&#39;ro&#39;,&#39;mg&#39;,&#39;im&#39;,&#39;mv&#39;,&#39;mt&#39;,&#39;mw&#39;,&#39;my&#39;,&#39;ml&#39;,&#39;mk&#39;,&#39;mh&#39;,&#39;mq&#39;,&#39;yt&#39;,&#39;mu&#39;,&#39;mr&#39;,&#39;us&#39;,&#39;um&#39;,&#39;as&#39;,&#39;vi&#39;,&#39;mn&#39;,&#39;ms&#39;,&#39;bd&#39;,&#39;pe&#39;,&#39;fm&#39;,&#39;mm&#39;,&#39;md&#39;,&#39;ma&#39;,&#39;mc&#39;,&#39;mz&#39;,&#39;mx&#39;,&#39;nr&#39;,&#39;np&#39;,&#39;ni&#39;,&#39;ne&#39;,&#39;ng&#39;,&#39;nu&#39;,&#39;no&#39;,&#39;nf&#39;,&#39;na&#39;,&#39;za&#39;,&#39;aq&#39;,&#39;gs&#39;,&#39;eu&#39;,&#39;pw&#39;,&#39;pn&#39;,&#39;pt&#39;,&#39;jp&#39;,&#39;se&#39;,&#39;ch&#39;,&#39;sv&#39;,&#39;ws&#39;,&#39;yu&#39;,&#39;sl&#39;,&#39;sn&#39;,&#39;cy&#39;,&#39;sc&#39;,&#39;sa&#39;,&#39;cx&#39;,&#39;st&#39;,&#39;sh&#39;,&#39;kn&#39;,&#39;lc&#39;,&#39;sm&#39;,&#39;pm&#39;,&#39;vc&#39;,&#39;lk&#39;,&#39;sk&#39;,&#39;si&#39;,&#39;sj&#39;,&#39;sz&#39;,&#39;sd&#39;,&#39;sr&#39;,&#39;sb&#39;,&#39;so&#39;,&#39;tj&#39;,&#39;tw&#39;,&#39;th&#39;,&#39;tz&#39;,&#39;to&#39;,&#39;tc&#39;,&#39;tt&#39;,&#39;tn&#39;,&#39;tv&#39;,&#39;tr&#39;,&#39;tm&#39;,&#39;tk&#39;,&#39;wf&#39;,&#39;vu&#39;,&#39;gt&#39;,&#39;ve&#39;,&#39;bn&#39;,&#39;ug&#39;,&#39;ua&#39;,&#39;uy&#39;,&#39;uz&#39;,&#39;es&#39;,&#39;eh&#39;,&#39;gr&#39;,&#39;hk&#39;,&#39;sg&#39;,&#39;nc&#39;,&#39;nz&#39;,&#39;hu&#39;,&#39;sy&#39;,&#39;jm&#39;,&#39;am&#39;,&#39;ac&#39;,&#39;ye&#39;,&#39;iq&#39;,&#39;ir&#39;,&#39;il&#39;,&#39;it&#39;,&#39;in&#39;,&#39;id&#39;,&#39;uk&#39;,&#39;vg&#39;,&#39;io&#39;,&#39;jo&#39;,&#39;vn&#39;,&#39;zm&#39;,&#39;je&#39;,&#39;td&#39;,&#39;gi&#39;,&#39;cl&#39;,&#39;cf&#39;,&#39;cn&#39;,&#39;yr&#39;,&#39;com&#39;,&#39;arpa&#39;,&#39;edu&#39;,&#39;gov&#39;,&#39;int&#39;,&#39;mil&#39;,&#39;net&#39;,&#39;org&#39;,&#39;biz&#39;,&#39;info&#39;,&#39;pro&#39;,&#39;name&#39;,&#39;museum&#39;,&#39;coop&#39;,&#39;aero&#39;,&#39;xxx&#39;,&#39;idv&#39;,&#39;me&#39;,&#39;mobi&#39;,&#39;asia&#39;,&#39;ax&#39;,&#39;bl&#39;,&#39;bq&#39;,&#39;cat&#39;,&#39;cw&#39;,&#39;gb&#39;,&#39;jobs&#39;,&#39;mf&#39;,&#39;rs&#39;,&#39;su&#39;,&#39;sx&#39;,&#39;tel&#39;,&#39;travel&#39;
  );
   
  if(!preg_match("/^http/is", $url)){
    $url="http://".$url;
  }
 
  $res = null;
  $res->domain = null;
  $res->host = null;
  $url_parse = parse_url(strtolower($url));
  $urlarr = explode(".", $url_parse[&#39;host&#39;]);
  $count = count($urlarr);
   
  if($count <= 2){
    #当域名直接根形式不存在host部分直接输出
    $res->domain = $url_parse[&#39;host&#39;];
  }elseif($count > 2){
    $last = array_pop($urlarr);
    $last_1 = array_pop($urlarr);
    $last_2 = array_pop($urlarr);
     
    $res->domain = $last_1.&#39;.&#39;.$last;
    $res->host = $last_2;
     
    if(in_array($last, $state_domain)){
      $res->domain=$last_1.&#39;.&#39;.$last;
      $res->host=implode(&#39;.&#39;, $urlarr);
    }
     
    if(in_array($last_1, $state_domain)){
      $res->domain = $last_2.&#39;.&#39;.$last_1.&#39;.&#39;.$last;
      $res->host = implode(&#39;.&#39;, $urlarr);
    }
    #print_r(get_defined_vars());die;
  }
  return $res;
   
}

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