PHP - Best way to find URL root from string? - php

Question

I use PHP.
I have an URL that looks like this
http://www.mydomain.com/mydir/mydir2/?something=hello
I want this:
http://www.mydomain.com
I did it like this but it feels like the wrong way to do it
To long and ugly.
$url = 'http://www.mydomain.com/mydir/mydir2/?something=hello';
$root_url_a = explode('/', $url);
$root_url = $root_url_a[0] . '//' . $root_url_a[2];
$root_url_clean = $root_url_a[2];
Suggestions
Regex?
Xpath?
Some for me unknown PHP function?
The shortest most correct way of doing it will get my vote.

Answer 1

Ok here is an example:
$url = parse_url('http://www.mydomain.com/mydir/mydir2/?something=hello');
echo $url->scheme.'://'.$url->host;
Is along the right lines.
Though technically this is not even right since depending on whether you send in a scheme or not for a url parse_url can actually change the way it assigns variables, so I wrote:
function return_url($url){
$parsed_url = parse_url($url);
if(!$parsed_url){
return false;
}
if(isset($parsed_url['scheme'])){
if(!isset($parsed_url['host'])){
return false;
}else{
return $parsed_url['scheme'].'://'.$parsed_url['host'];
}
}
if(isset($parsed_url['path'])){
return 'http://'.$parsed_url['path'];
}
return false;
}

Answer 2

I would do it like this:
$url = "http://www.mydomain.com/mydir/mydir2/?something=hello";
echo parse_url($url, PHP_URL_HOST);
// Would echo:
http://www.mydomain.com

Answer 3

I would say RTM ;)
http://php.net/manual/en/function.parse-url.php
<?php
$url = 'http://username:password#hostname/path?arg=value#anchor';
print_r(parse_url($url));
echo parse_url($url, PHP_URL_HOST);
?>