如何在URL上使用preg_replace

Question

How do I use preg_replace text/url. For example, I have a url like this: http://www.web.org/dorama/1201102144/hitoya-no-toge. I just want to show web.org. The url is not always same, for example sometimes it's: http://www.web.org/movies/123/no etc.

I only know the basics of it. Here is what I tried. It still does not delete the slash.

$url = "http://www.web.org/dorama/1201102144/hitoya-no-toge";
$patterns = array();
$patterns[0] = '/http:/';
$patterns[1] = '/dorama/';
$patterns[2] = '/1201102144/';
$replacements = array();
$replacements[2] = '';
$replacements[1] = '';
$replacements[0] = '';
echo preg_replace($patterns, $replacements, $url);

result when i run it //www.web.org///hitoya-no-toge

Answer 1

Use preg_match instead preg_replace i think http://php.net/manual/en/function.preg-match.php

// get host name from URL
preg_match('@^(?:http://)?([^/]+)@i', $url, $matches);
$host = $matches[1];

// get last two segments of host name
preg_match('/[^.]+\.[^.]+$/', $host, $matches);
echo "{$matches[0]}"

If use https change http to https, I don't know how to make it work for http and https.