没想到（php获取IP地址）php获取当前时间的函数，php获取顶级域名/一级域名的方法，php获取顶级域名/一级域名的方法，
列出几个网上收集的关于利用php脚本获取顶级域名的方法，可能分析的不是很完全，大家可以参考一下，适当的做一些调整。
php获取顶级域名的方法
示例1：
function url_root($url
=""){
$url
= $url
? $url
: $_SERVER
["HTTP_HOST"];
$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 $host
;
}复制
示例2：
function getDoMain($url
)
{
if(empty($url
)){
return ;
}
if(strpos($url
,http://) !== false){
$url
= str_replace(http://,,$url
);
}
if(strpos($url
,https://) !== false){
$url
= str_replace(https://,,$url
);
}
$n
= 0;
for($i
= 1;$i
<= 3;$i
++) {
$n
= strpos($url
, /, $n
);
$i
!= 3 && $n
++;
}
$nn
= strpos($url
, ?);
$mix_num
= min($n
,$nn
);
if($mix_num
> 0 || !empty($mix_num
)){
$url
= mb_substr($url
,0,$mix_num
);
}
$data
= explode(., $url
);
$co_ta
= count($data
);
//判断是否是双后缀
$no_tow
= true;
$host_cn
= com.cn,net.cn,org.cn,gov.cn;
$host_cn
= explode(,, $host_cn
);
foreach($host_cn
as $val
){
if(strpos($url
,$val
)){
$no_tow
= false;
}
}
//截取域名后的目录
$del
= strpos($data
[$co_ta
-1], /);
if($del
> 0 || !empty($del
)){
$data
[$co_ta
-1] = mb_substr($data
[$co_ta
-1],0,$del
);
}
//如果是返回FALSE ，如果不是返回true
if($no_tow
== true){
$host
= $data
[$co_ta
-2]...$data
[$co_ta
-1];
}else{
$host
= $data
[$co_ta
-3]...$data
[$co_ta
-2]...$data
[$co_ta
-1];
}
return $host
;
}复制
示例3：
function get_host($to_virify_url
= )
{
$url
= $to_virify_url
? $to_virify_url
: $_SERVER
[HTTP_HOST];
$data
= explode(., $url
);
$co_ta
= count($data
);
$zi_tow
= true;
$host_cn
= com.cn,net.cn,org.cn,gov.cn;
$host_cn
= explode(,, $host_cn
);
foreach($host_cn
as $host
){
if(strpos($url
,$host
)){
$zi_tow
= false;
}
}
if($zi_tow
== true){
if($url
== localhost){
$host
= $data
[$co_ta
-1];
}else{
$host
= $data
[$co_ta
-2]...$data
[$co_ta
-1];
}
}else{
$host
= $data
[$co_ta
-3]...$data
[$co_ta
-2]...$data
[$co_ta
-1];
}
return $host
;
}复制
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