blocks|key|1694188|text|查看parse_url()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1694189|$url+=+'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$parse+=+parse_url($url);
echo+$parse['host'];+//+prints+'google.com'|code-block|syntax|javascript|1694190|parse_url不能很好地处理严重损坏的urls，但如果您通常希望得到像样的urls，那就很好了。|1694191|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/parse_url^0|2|B|2|B|0|0|0|0|9|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Check out <a href="http://php.net/parse_url" rel="noreferrer"><code>parse_url()</code></a>:

<pre><code>$url = 'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$parse = parse_url($url);
echo $parse['host']; // prints 'google.com'
</code></pre>

<code>parse_url</code> doesn't handle really badly mangled urls very well, but is fine if you generally expect decent urls.

blocks|key|1478918|text|这是我写的代码，100%25只查找域名，因为它需要mozilla的子tlds。你唯一需要检查的就是你是如何缓存这个文件的，所以你不需要每次都查询mozilla。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1478919|由于一些奇怪的原因，像co.uk这样的域名不在列表中，所以你必须进行一些黑客攻击并手动添加它们。这不是最干净的解决方案，但我希望它能帮助一些人。|1478920|//=====================================================
static+function+domain($url)
{
++++$slds+=+"";
++++$url+=+strtolower($url);

++++++++++++$address+=+'http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1';
++++if(!$subtlds+=+@kohana::cache('subtlds',+null,+60))+
++++{
++++++++$content+=+file($address);
++++++++foreach($content+as+$num+=>+$line)
++++++++{
++++++++++++$line+=+trim($line);
++++++++++++if($line+==+'')+continue;
++++++++++++if(@substr($line[0],+0,+2)+==+'/')+continue;
++++++++++++$line+=+@preg_replace("/[%5Ea-zA-Z0-9\.]/",+'',+$line);
++++++++++++if($line+==+'')+continue;++//$line+=+'.'.$line;
++++++++++++if(@$line[0]+==+'.')+$line+=+substr($line,+1);
++++++++++++if(!strstr($line,+'.'))+continue;
++++++++++++$subtlds[]+=+$line;
++++++++++++//echo+"{$num}:+'{$line}'";+echo+" ";
++++++++}
++++++++$subtlds+=+array_merge(Array(
++++++++++++'co.uk',+'me.uk',+'net.uk',+'org.uk',+'sch.uk',+'ac.uk',+
++++++++++++'gov.uk',+'nhs.uk',+'police.uk',+'mod.uk',+'asn.au',+'com.au',
++++++++++++'net.au',+'id.au',+'org.au',+'edu.au',+'gov.au',+'csiro.au',
++++++++++++),$subtlds);

++++++++$subtlds+=+array_unique($subtlds);
++++++++//echo+var_dump($subtlds);
++++++++@kohana::cache('subtlds',+$subtlds);
++++}


++++preg_match('/%5E(http:[\/]{2,})?([%5E\/]%2B)/i',+$url,+$matches);
++++//preg_match("/%5E(http:\/\/%7Chttps:\/\/%7C)[a-zA-Z-]([%5E\/]%2B)/i",+$url,+$matches);
++++$host+=+@$matches[2];
++++//echo+var_dump($matches);

++++preg_match("/[%5E\.\/]%2B\.[%5E\.\/]%2B$/",+$host,+$matches);
++++foreach($subtlds+as+$sub)+
++++{
++++++++if+(preg_match("/{$sub}$/",+$host,+$xyz))
++++++++preg_match("/[%5E\.\/]%2B\.[%5E\.\/]%2B\.[%5E\.\/]%2B$/",+$host,+$matches);
++++}

++++return+@$matches[0];
}|code-block|syntax|javascript|1478921|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here is the code i made that 100% finds only the domain name, since it takes mozilla sub tlds to account. Only thing you have to check is how you make cache of that file, so you dont query mozilla every time. 

For some strange reason, domains like co.uk are not in the list, so you have to make some hacking and add them manually. Its not cleanest solution but i hope it helps someone. 

<pre><code>//=====================================================
static function domain($url)
{
 $slds = "";
 $url = strtolower($url);

 $address = 'http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1';
 if(!$subtlds = @kohana::cache('subtlds', null, 60)) 
 {
 $content = file($address);
 foreach($content as $num =&gt; $line)
 {
 $line = trim($line);
 if($line == '') continue;
 if(@substr($line[0], 0, 2) == '/') continue;
 $line = @preg_replace("/[^a-zA-Z0-9\.]/", '', $line);
 if($line == '') continue; //$line = '.'.$line;
 if(@$line[0] == '.') $line = substr($line, 1);
 if(!strstr($line, '.')) continue;
 $subtlds[] = $line;
 //echo "{$num}: '{$line}'"; echo "&lt;br&gt;";
 }
 $subtlds = array_merge(Array(
 'co.uk', 'me.uk', 'net.uk', 'org.uk', 'sch.uk', 'ac.uk', 
 'gov.uk', 'nhs.uk', 'police.uk', 'mod.uk', 'asn.au', 'com.au',
 'net.au', 'id.au', 'org.au', 'edu.au', 'gov.au', 'csiro.au',
 ),$subtlds);

 $subtlds = array_unique($subtlds);
 //echo var_dump($subtlds);
 @kohana::cache('subtlds', $subtlds);
 }


 preg_match('/^(http:[\/]{2,})?([^\/]+)/i', $url, $matches);
 //preg_match("/^(http:\/\/|https:\/\/|)[a-zA-Z-]([^\/]+)/i", $url, $matches);
 $host = @$matches[2];
 //echo var_dump($matches);

 preg_match("/[^\.\/]+\.[^\.\/]+$/", $host, $matches);
 foreach($subtlds as $sub) 
 {
 if (preg_match("/{$sub}$/", $host, $xyz))
 preg_match("/[^\.\/]+\.[^\.\/]+\.[^\.\/]+$/", $host, $matches);
 }

 return @$matches[0];
}
</code></pre>

blocks|key|1694290|text|本应100%25工作的代码似乎不适合我，我确实对示例打了一点补丁，但发现没有帮助的代码和它的问题。所以我把它改成了几个函数(省去了一直向Mozilla索要列表和删除缓存系统的麻烦)。这已经在一组1000个URL上进行了测试，似乎是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1694291|function+domain($url)
{
++++global+$subtlds;
++++$slds+=+"";
++++$url+=+strtolower($url);

++++$host+=+parse_url('http://'.$url,PHP_URL_HOST);

++++preg_match("/[%5E\.\/]%2B\.[%5E\.\/]%2B$/",+$host,+$matches);
++++foreach($subtlds+as+$sub){
++++++++if+(preg_match('/\.'.preg_quote($sub).'$/',+$host,+$xyz)){
++++++++++++preg_match("/[%5E\.\/]%2B\.[%5E\.\/]%2B\.[%5E\.\/]%2B$/",+$host,+$matches);
++++++++}
++++}

++++return+@$matches[0];
}

function+get_tlds()+{
++++$address+=+'http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1';
++++$content+=+file($address);
++++foreach+($content+as+$num+=>+$line)+{
++++++++$line+=+trim($line);
++++++++if($line+==+'')+continue;
++++++++if(@substr($line[0],+0,+2)+==+'/')+continue;
++++++++$line+=+@preg_replace("/[%5Ea-zA-Z0-9\.]/",+'',+$line);
++++++++if($line+==+'')+continue;++//$line+=+'.'.$line;
++++++++if(@$line[0]+==+'.')+$line+=+substr($line,+1);
++++++++if(!strstr($line,+'.'))+continue;
++++++++$subtlds[]+=+$line;
++++++++//echo+"{$num}:+'{$line}'";+echo+" ";
++++}

++++$subtlds+=+array_merge(array(
++++++++++++'co.uk',+'me.uk',+'net.uk',+'org.uk',+'sch.uk',+'ac.uk',+
++++++++++++'gov.uk',+'nhs.uk',+'police.uk',+'mod.uk',+'asn.au',+'com.au',
++++++++++++'net.au',+'id.au',+'org.au',+'edu.au',+'gov.au',+'csiro.au'
++++++++),+$subtlds);

++++$subtlds+=+array_unique($subtlds);

++++return+$subtlds;++++
}|code-block|syntax|javascript|1694292|然后像这样使用它|1694293|$subtlds+=+get_tlds();
echo+domain('www.example.com')+//outputs:+example.com
echo+domain('www.example.uk.com')+//outputs:+example.uk.com
echo+domain('www.example.fr')+//outputs:+example.fr|1694294|我知道我应该把它变成一个班级，但是没有时间。|1694295|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

The code that was meant to work 100% didn't seem to cut it for me, I did patch the example a little but found code that wasn't helping and problems with it. so I changed it out to a couple of functions (to save asking for the list from Mozilla all the time, and removing the cache system). This has been tested against a set of 1000 URLs and seemed to work.

<pre><code>function domain($url)
{
 global $subtlds;
 $slds = "";
 $url = strtolower($url);

 $host = parse_url('http://'.$url,PHP_URL_HOST);

 preg_match("/[^\.\/]+\.[^\.\/]+$/", $host, $matches);
 foreach($subtlds as $sub){
 if (preg_match('/\.'.preg_quote($sub).'$/', $host, $xyz)){
 preg_match("/[^\.\/]+\.[^\.\/]+\.[^\.\/]+$/", $host, $matches);
 }
 }

 return @$matches[0];
}

function get_tlds() {
 $address = 'http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1';
 $content = file($address);
 foreach ($content as $num =&gt; $line) {
 $line = trim($line);
 if($line == '') continue;
 if(@substr($line[0], 0, 2) == '/') continue;
 $line = @preg_replace("/[^a-zA-Z0-9\.]/", '', $line);
 if($line == '') continue; //$line = '.'.$line;
 if(@$line[0] == '.') $line = substr($line, 1);
 if(!strstr($line, '.')) continue;
 $subtlds[] = $line;
 //echo "{$num}: '{$line}'"; echo "&lt;br&gt;";
 }

 $subtlds = array_merge(array(
 'co.uk', 'me.uk', 'net.uk', 'org.uk', 'sch.uk', 'ac.uk', 
 'gov.uk', 'nhs.uk', 'police.uk', 'mod.uk', 'asn.au', 'com.au',
 'net.au', 'id.au', 'org.au', 'edu.au', 'gov.au', 'csiro.au'
 ), $subtlds);

 $subtlds = array_unique($subtlds);

 return $subtlds; 
}
</code></pre>

Then use it like

<pre><code>$subtlds = get_tlds();
echo domain('www.example.com') //outputs: example.com
echo domain('www.example.uk.com') //outputs: example.uk.com
echo domain('www.example.fr') //outputs: example.fr
</code></pre>

I know I should have turned this into a class, but didn't have time.

blocks|key|1478984|text|parse_url对我不起作用。它只返回路径。使用php5.3%2B切换到基础知识：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1478985|$url++=+str_replace('http://',+'',+strtolower(+$s->website));
if+(strpos($url,+'/'))++$url+=+strstr($url,+'/',+true);|code-block|syntax|javascript|1478986|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

parse_url didn't work for me. It only returned the path. Switching to basics using php5.3+:

<pre><code>$url = str_replace('http://', '', strtolower( $s-&gt;website));
if (strpos($url, '/')) $url = strstr($url, '/', true);
</code></pre>

blocks|key|1694332|text|您可以将PHP_URL_HOST作为第二个参数传递给parse_url函数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1694333|$url+=+'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$host+=+parse_url($url,+PHP_URL_HOST);
print+$host;+//+prints+'google.com'|code-block|syntax|javascript|1694334|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can pass PHP_URL_HOST into parse_url function as second parameter

<pre><code>$url = 'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$host = parse_url($url, PHP_URL_HOST);
print $host; // prints 'google.com'
</code></pre>

blocks|key|1694366|text|我已经为你编辑好了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1694367|function+getHost($Address)+{+
++++$parseUrl+=+parse_url(trim($Address));
++++$host+=+trim($parseUrl['host']+?+$parseUrl['host']+:+array_shift(explode('/',+$parseUrl['path'],+2)));+

++++$parts+=+explode(+'.',+$host+);
++++$num_parts+=+count($parts);

++++if+($parts[0]+==+"www")+{
++++++++for+($i=1;+$i+<+$num_parts;+$i%2B%2B)+{+
++++++++++++$h+.=+$parts[$i]+.+'.';
++++++++}
++++}else+{
++++++++for+($i=0;+$i+<+$num_parts;+$i%2B%2B)+{+
++++++++++++$h+.=+$parts[$i]+.+'.';
++++++++}
++++}
++++return+substr($h,0,-1);
}|code-block|syntax|javascript|1694368|所有类型的url+(www.domain.ltd，sub1.subn.domain.ltd将得到:+domain.ltd。|1694369|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I have edited for you:

<pre><code>function getHost($Address) { 
 $parseUrl = parse_url(trim($Address));
 $host = trim($parseUrl['host'] ? $parseUrl['host'] : array_shift(explode('/', $parseUrl['path'], 2))); 

 $parts = explode( '.', $host );
 $num_parts = count($parts);

 if ($parts[0] == "www") {
 for ($i=1; $i &lt; $num_parts; $i++) { 
 $h .= $parts[$i] . '.';
 }
 }else {
 for ($i=0; $i &lt; $num_parts; $i++) { 
 $h .= $parts[$i] . '.';
 }
 }
 return substr($h,0,-1);
}
</code></pre>

All type url (www.domain.ltd, sub1.subn.domain.ltd will result to : domain.ltd.

blocks|key|1479028|text|$domain+=+parse_url($url,+PHP_URL_HOST);
echo+implode('.',+array_slice(explode('.',+$domain),+-2,+2))|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1479029|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$domain = parse_url($url, PHP_URL_HOST);
echo implode('.', array_slice(explode('.', $domain), -2, 2))
</code></pre>

blocks|key|1694375|text|function+get_domain($url+=+SITE_URL)
{
++++preg_match("/[a-z0-9\-]{1,63}\.[a-z\.]{2,6}$/",+parse_url($url,+PHP_URL_HOST),+$_domain_tld);
++++return+$_domain_tld[0];
}

get_domain('http://www.cdl.gr');+//cdl.gr
get_domain('http://cdl.gr');+//cdl.gr
get_domain('http://www2.cdl.gr');+//cdl.gr|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1694376|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function get_domain($url = SITE_URL)
{
 preg_match("/[a-z0-9\-]{1,63}\.[a-z\.]{2,6}$/", parse_url($url, PHP_URL_HOST), $_domain_tld);
 return $_domain_tld[0];
}

get_domain('http://www.cdl.gr'); //cdl.gr
get_domain('http://cdl.gr'); //cdl.gr
get_domain('http://www2.cdl.gr'); //cdl.gr
</code></pre>

blocks|key|1694400|text|就像下面这样使用...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1694401|<?php
+++echo+$_SERVER['SERVER_NAME'];
?>|code-block|syntax|javascript|1694402|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just use as like following ...

<pre><code>&lt;?php
 echo $_SERVER['SERVER_NAME'];
?&gt;
</code></pre>

blocks|key|1694424|text|如果您想从字符串http://google.com/dhasjkdas/sadsdds/sdda/sdads.html中提取主机，使用parse_url()是您可以接受的解决方案。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1694425|但是，如果你想提取域名或它的部分，你需要使用Public+Suffix+List打包。是的，您可以使用parse_url()周围的字符串函数，但有时会产生不正确的结果。|1694426|我推荐使用TLDExtract进行域解析，下面的示例代码显示了不同之处：|1694427|$extract+=+new+LayerShifter\TLDExtract\Extract();

#+For+'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html'

$url+=+'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';

parse_url($url,+PHP_URL_HOST);+//+will+return+google.com

$result+=+$extract->parse($url);
$result->getFullHost();+//+will+return+'google.com'
$result->getRegistrableDomain();+//+will+return+'google.com'
$result->getSuffix();+//+will+return+'com'

#+For+'http://search.google.com/dhasjkdas/sadsdds/sdda/sdads.html'

$url+=+'http://search.google.com/dhasjkdas/sadsdds/sdda/sdads.html';

parse_url($url,+PHP_URL_HOST);+//+will+return+'search.google.com'

$result+=+$extract->parse($url);
$result->getFullHost();+//+will+return+'search.google.com'
$result->getRegistrableDomain();+//+will+return+'google.com'|code-block|syntax|javascript|1694428|entityMap|0|LINK|mutability|MUTABLE|url|https://publicsuffix.org/|1|https://github.com/layershifter/TLDExtract^0|8|1F|0|M|I|0|0|5|A|1|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|J|3|K|5|L|7|19|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

If you want extract host from string <code>http://google.com/dhasjkdas/sadsdds/sdda/sdads.html</code>, usage of parse_url() is acceptable solution for you.

But if you want extract domain or its parts, you need package that using <a href="https://publicsuffix.org/" rel="noreferrer">Public Suffix List</a>. Yes, you can use string functions arround parse_url(), but it will produce incorrect results sometimes.

I recomend <a href="https://github.com/layershifter/TLDExtract" rel="noreferrer">TLDExtract</a> for domain parsing, here is sample code that show diff:

<pre><code>$extract = new LayerShifter\TLDExtract\Extract();

# For 'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html'

$url = 'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';

parse_url($url, PHP_URL_HOST); // will return google.com

$result = $extract-&gt;parse($url);
$result-&gt;getFullHost(); // will return 'google.com'
$result-&gt;getRegistrableDomain(); // will return 'google.com'
$result-&gt;getSuffix(); // will return 'com'

# For 'http://search.google.com/dhasjkdas/sadsdds/sdda/sdads.html'

$url = 'http://search.google.com/dhasjkdas/sadsdds/sdda/sdads.html';

parse_url($url, PHP_URL_HOST); // will return 'search.google.com'

$result = $extract-&gt;parse($url);
$result-&gt;getFullHost(); // will return 'search.google.com'
$result-&gt;getRegistrableDomain(); // will return 'google.com'
</code></pre>

blocks|key|1479182|text|我发现@philfreo的解决方案(引用自php.net)可以获得很好的效果，但在某些情况下，它会显示php的“通知”和“严格标准”消息。这里是这个代码的固定版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1479183|function+getHost($url)+{+
+++$parseUrl+=+parse_url(trim($url));+
+++if(isset($parseUrl['host']))
+++{
+++++++$host+=+$parseUrl['host'];
+++}
+++else
+++{
++++++++$path+=+explode('/',+$parseUrl['path']);
++++++++$host+=+$path[0];
+++}
+++return+trim($host);+
}+

echo+getHost("http://example.com/anything.html");+++++++++++//+example.com
echo+getHost("http://www.example.net/directory/post.php");++//+www.example.net
echo+getHost("https://example.co.uk");++++++++++++++++++++++//+example.co.uk
echo+getHost("www.example.net");++++++++++++++++++++++++++++//+example.net
echo+getHost("subdomain.example.net/anything");+++++++++++++//+subdomain.example.net
echo+getHost("example.net");++++++++++++++++++++++++++++++++//+example.net|code-block|syntax|javascript|1479184|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've found that @philfreo's solution (referenced from php.net) is pretty well to get fine result but in some cases it shows php's "notice" and "Strict Standards" message. Here a fixed version of this code.

<pre><code>function getHost($url) { 
 $parseUrl = parse_url(trim($url)); 
 if(isset($parseUrl['host']))
 {
 $host = $parseUrl['host'];
 }
 else
 {
 $path = explode('/', $parseUrl['path']);
 $host = $path[0];
 }
 return trim($host); 
} 

echo getHost("http://example.com/anything.html"); // example.com
echo getHost("http://www.example.net/directory/post.php"); // www.example.net
echo getHost("https://example.co.uk"); // example.co.uk
echo getHost("www.example.net"); // example.net
echo getHost("subdomain.example.net/anything"); // subdomain.example.net
echo getHost("example.net"); // example.net
</code></pre>

blocks|key|1479226|text|请考虑将接受的解决方案替换为以下解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1479227|parse_url()总是包含任何子域，所以这个函数不能很好地解析域名。下面是一些示例：|1479228|$url+=+'http://www.google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$parse+=+parse_url($url);
echo+$parse['host'];+//+prints+'www.google.com'

echo+parse_url('https://subdomain.example.com/foo/bar',+PHP_URL_HOST);
//+Output:+subdomain.example.com

echo+parse_url('https://subdomain.example.co.uk/foo/bar',+PHP_URL_HOST);
//+Output:+subdomain.example.co.uk|code-block|syntax|javascript|1479229|取而代之的是，你可以考虑这个实用的解决方案。它将涵盖许多但不是所有的域名--例如，诸如'sos.state.oh.us‘之类的较低级别的域名不包括在内。|1479230|function+getDomain($url)+{
++++$host+=+parse_url($url,+PHP_URL_HOST);

++++if(filter_var($host,FILTER_VALIDATE_IP))+{
++++++++//+IP+address+returned+as+domain
++++++++return+$host;+//*+or+replace+with+null+if+you+don't+want+an+IP+back
++++}

++++$domain_array+=+explode(".",+str_replace('www.',+'',+$host));
++++$count+=+count($domain_array);
++++if(+$count>=3+&&+strlen($domain_array[$count-2])==2+)+{
++++++++//+SLD+(example.co.uk)
++++++++return+implode('.',+array_splice($domain_array,+$count-3,3));
++++}+else+if(+$count>=2+)+{
++++++++//+TLD+(example.com)
++++++++return+implode('.',+array_splice($domain_array,+$count-2,2));
++++}
}

//+Your+domains
++++echo+getDomain('http://google.com/dhasjkdas/sadsdds/sdda/sdads.html');+//+google.com
++++echo+getDomain('http://www.google.com/dhasjkdas/sadsdds/sdda/sdads.html');+//+google.com
++++echo+getDomain('http://google.co.uk/dhasjkdas/sadsdds/sdda/sdads.html');+//+google.co.uk

//+TLD
++++echo+getDomain('https://shop.example.com');+//+example.com
++++echo+getDomain('https://foo.bar.example.com');+//+example.com
++++echo+getDomain('https://www.example.com');+//+example.com
++++echo+getDomain('https://example.com');+//+example.com

//+SLD
++++echo+getDomain('https://more.news.bbc.co.uk');+//+bbc.co.uk
++++echo+getDomain('https://www.bbc.co.uk');+//+bbc.co.uk
++++echo+getDomain('https://bbc.co.uk');+//+bbc.co.uk

//+IP
++++echo+getDomain('https://1.2.3.45');++//+1.2.3.45|1479231|最后，Jeremy+Kendall的PHP+Domain+Parser允许您从url解析域名。League+URI+Hostname+Parser也将完成这项工作。|offset|length|1479232|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/jeremykendall/php-domain-parser|1|https://uri.thephpleague.com/domain-parser/1.0/^0|0|0|0|0|0|I|H|0|1B|Q|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@$O|16|P|17|1|18]|$O|19|P|1A|1|1B]]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

Please consider replacring the accepted solution with the following:

parse_url() will always include any sub-domain(s), so this function doesn't parse domain names very well.
Here are some examples:

<pre><code>$url = 'http://www.google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$parse = parse_url($url);
echo $parse['host']; // prints 'www.google.com'

echo parse_url('https://subdomain.example.com/foo/bar', PHP_URL_HOST);
// Output: subdomain.example.com

echo parse_url('https://subdomain.example.co.uk/foo/bar', PHP_URL_HOST);
// Output: subdomain.example.co.uk
</code></pre>

Instead, you may consider this pragmatic solution.
It will cover many, but not all domain names -- for instance, lower-level domains such as 'sos.state.oh.us' are not covered.

<pre><code>function getDomain($url) {
 $host = parse_url($url, PHP_URL_HOST);

 if(filter_var($host,FILTER_VALIDATE_IP)) {
 // IP address returned as domain
 return $host; //* or replace with null if you don't want an IP back
 }

 $domain_array = explode(".", str_replace('www.', '', $host));
 $count = count($domain_array);
 if( $count&gt;=3 &amp;&amp; strlen($domain_array[$count-2])==2 ) {
 // SLD (example.co.uk)
 return implode('.', array_splice($domain_array, $count-3,3));
 } else if( $count&gt;=2 ) {
 // TLD (example.com)
 return implode('.', array_splice($domain_array, $count-2,2));
 }
}

// Your domains
 echo getDomain('http://google.com/dhasjkdas/sadsdds/sdda/sdads.html'); // google.com
 echo getDomain('http://www.google.com/dhasjkdas/sadsdds/sdda/sdads.html'); // google.com
 echo getDomain('http://google.co.uk/dhasjkdas/sadsdds/sdda/sdads.html'); // google.co.uk

// TLD
 echo getDomain('https://shop.example.com'); // example.com
 echo getDomain('https://foo.bar.example.com'); // example.com
 echo getDomain('https://www.example.com'); // example.com
 echo getDomain('https://example.com'); // example.com

// SLD
 echo getDomain('https://more.news.bbc.co.uk'); // bbc.co.uk
 echo getDomain('https://www.bbc.co.uk'); // bbc.co.uk
 echo getDomain('https://bbc.co.uk'); // bbc.co.uk

// IP
 echo getDomain('https://1.2.3.45'); // 1.2.3.45
</code></pre>

Finally, Jeremy Kendall's <a href="https://github.com/jeremykendall/php-domain-parser" rel="nofollow noreferrer">PHP Domain Parser</a> allows you to parse the domain name from a url. <a href="https://uri.thephpleague.com/domain-parser/1.0/" rel="nofollow noreferrer">League URI Hostname Parser</a> will also do the job.

blocks|key|1694553|text|function+getTrimmedUrl($link)
{
++++$str+=+str_replace(["www.","https://","http://"],[''],$link);
++++$link+=+explode("/",$str);
++++return+strtolower($link[0]);++++++++++++++++
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1694554|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function getTrimmedUrl($link)
{
 $str = str_replace(["www.","https://","http://"],[''],$link);
 $link = explode("/",$str);
 return strtolower($link[0]); 
}
</code></pre>

I need to build a function which parses the domain from a URL.
So, with
<pre><code>http://google.com/dhasjkdas/sadsdds/sdda/sdads.html
</code></pre>
or
<pre><code>http://www.google.com/dhasjkdas/sadsdds/sdda/sdads.html
</code></pre>
it should return <code>google.com</code>
with
<pre><code>http://google.co.uk/dhasjkdas/sadsdds/sdda/sdads.html
</code></pre>
it should return <code>google.co.uk</code>.

Parsing domain from a URL

我需要建立一个从URL解析域名的函数。因此，使用http://google.com/dhasjkdas/sadsdds/sdda/sdads.html或http://www.google.com/dhasjkdas/sadsdds/sdda/sdads.html它应该返回google.com使用http://googl...

问从URL解析域名
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