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PHP实现通过URL提取根域名
来源:易贤网 阅读:1775 次 日期:2016-08-31 14:30:42
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PHP根据URL提取根域名,个人工作中用到,由于网络上很多代码都不能得到正确结果就自己写了一个,欢迎大家使用并提出其中的bug.

<?php 

#使用示例

echo getBaseDomain('http://blog.jp.goo.ne.jp/index.php')->domain;echo "\n";

echo getBaseDomain('http://51.ca/index.php')->domain;echo "\n";

echo getBaseDomain('http://blog.ab.cc.win.aisa.hk/index.php')->domain;echo "\n";

function getBaseDomain($url=''){

  if(!$url){

    return $url;

  }

  #列举域名中固定元素

  $state_domain = array(

    'al','dz','af','ar','ae','aw','om','az','eg','et','ie','ee','ad','ao','ai','ag','at','au','mo','bb','pg','bs','pk','py','ps','bh','pa','br','by','bm','bg','mp','bj','be','is','pr','ba','pl','bo','bz','bw','bt','bf','bi','bv','kp','gq','dk','de','tl','tp','tg','dm','do','ru','ec','er','fr','fo','pf','gf','tf','va','ph','fj','fi','cv','fk','gm','cg','cd','co','cr','gg','gd','gl','ge','cu','gp','gu','gy','kz','ht','kr','nl','an','hm','hn','ki','dj','kg','gn','gw','ca','gh','ga','kh','cz','zw','cm','qa','ky','km','ci','kw','cc','hr','ke','ck','lv','ls','la','lb','lt','lr','ly','li','re','lu','rw','ro','mg','im','mv','mt','mw','my','ml','mk','mh','mq','yt','mu','mr','us','um','as','vi','mn','ms','bd','pe','fm','mm','md','ma','mc','mz','mx','nr','np','ni','ne','ng','nu','no','nf','na','za','aq','gs','eu','pw','pn','pt','jp','se','ch','sv','ws','yu','sl','sn','cy','sc','sa','cx','st','sh','kn','lc','sm','pm','vc','lk','sk','si','sj','sz','sd','sr','sb','so','tj','tw','th','tz','to','tc','tt','tn','tv','tr','tm','tk','wf','vu','gt','ve','bn','ug','ua','uy','uz','es','eh','gr','hk','sg','nc','nz','hu','sy','jm','am','ac','ye','iq','ir','il','it','in','id','uk','vg','io','jo','vn','zm','je','td','gi','cl','cf','cn','yr','com','arpa','edu','gov','int','mil','net','org','biz','info','pro','name','museum','coop','aero','xxx','idv','me','mobi','asia','ax','bl','bq','cat','cw','gb','jobs','mf','rs','su','sx','tel','travel'

  );

  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['host']);

  $count = count($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['host'];

  }elseif($count > 2){

    $last = array_pop($urlarr);

    $last_1 = array_pop($urlarr);

    $last_2 = array_pop($urlarr);

    $res->domain = $last_1.'.'.$last;

    $res->host = $last_2;

    if(in_array($last, $state_domain)){

      $res->domain=$last_1.'.'.$last;

      $res->host=implode('.', $urlarr);

    }

    if(in_array($last_1, $state_domain)){

      $res->domain = $last_2.'.'.$last_1.'.'.$last;

      $res->host = implode('.', $urlarr);

    }

    #print_r(get_defined_vars());die;

  }

  return $res;

}

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