Parsing complex URLs - php

Question

I try to parse a list of url strings, after two hours of work I don't reach any result, the list of url strings look like this:
$url_list = array(
'http://google.com',
'http://localhost:8080/test/project/',
'http://mail.yahoo.com',
'http://www.bing.com',
'http://www.phpromania.net/forum/viewtopic.php?f=24&t=7549',
'https://prodgame10.alliances.commandandconquer.com/12/index.aspx',
'https://prodgame10.alliances.commandandconquer.ro/12/index.aspx',
);
Output should be:
Array
(
[0] => .google.com
[1] => .localhost
[2] => .yahoo.com
[3] => .bing.com
[4] => .phpromania.net
[5] => .commandandconquer.com
)
The first thing what induce me in the error zone is more than 2 dots in the url.
Any algorithm example?
This is what I try:
$url_list = array(
'http://google.com',
'http://localhost:8080/test/project/',
'http://mail.yahoo.com',
'http://www.bing.com',
'http://www.phpromania.net/forum/viewtopic.php?f=24&t=27549',
'https://prodgame10.alliances.commandandconquer.com/12/index.aspx',
);
function size($list)
{
$i=0;
while($list[++$i]!=NULL);
return $i;
}
function url_Host($list)
{
$listSize = size($list)-1;
do
{
$strSize = size($list[$listSize]);
$points = 0;
$dpoints = 0;
$tmpString = '';
do
{
$currentChar = $list[$listSize][$strSize];
if(ord('.')==ord($currentChar))
{
$tmpString .= '.';
$points++;
}
else if(ord(':')==ord($currentChar))
{
$tmpString .= ':';
$dpoints++;
}
}while($list[$listSize][--$strSize]!=NULL);
print $tmpString;
$strSize = size($list[$listSize]);
$tmpString = '';
do
{
$slice = false;
$currentChar = $list[$listSize][$strSize];
if($dpoints > 2)
{
if(ord('\\')==ord($curentChar)) $slice = true;
$tmpString .= '';
}
}while($list[$listSize][--$strSize]!=NULL);
print $tmpString."<br />";
}while($list[--$listSize]);
}
url_Host($url_list);

Answer 1

You can use the built-in function parse_url() as follows:
function getDomain($url)
{
$domain = implode('.', array_slice(explode('.', parse_url($url, PHP_URL_HOST)), -2));
return $domain;
}
Test cases:
foreach ($url_list as $url) {
$result[] = getDomain($url);
}
Output:
Array
(
[0] => google.com
[1] => localhost
[2] => yahoo.com
[3] => bing.com
[4] => phpromania.net
[5] => commandandconquer.com
[6] => commandandconquer.ro
)
As for the dots, you can manually prepend them to string, like so:
$result[] = "." . getDomain($url);
I'm not sure why you need to do this, but this should work.
Demo!

Answer 2

Look at parse_url. For example:
$url = 'http://www.phpromania.net/forum/viewtopic.php?f=24&t=7549';
$host = parse_url($url, PHP_URL_HOST);

Answer 3

First the result for localhost is no sense, but try this:
$result =array();
foreach($url_list as $u){
$arr = explode('//',$u);
$arr2 = explode('.', $arr[1]);
if($arr2[0] == 'www')
array_push($result, $arr2[1]);
else
array_push($result, $arr2[0]);
}

Answer 4

We can also use array_map() with an arrow function to simplify the code.
I'm refactoring #Alessandro Minoccheri's code here.
$domains = array_map(fn($url) => implode('.', array_slice(explode('.', parse_url($url, PHP_URL_HOST)), -2)),$urls);
var_dump($domains);