PHP REGEX: Get domain from URL

Question

What I want

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I want to get from a URL the domain part so from http://example.com/ -> example.com

Answer 1

I use:

$domain = parse_url('http://' . str_replace(array('https://', 'http://'), '', $url), PHP_URL_HOST);

Because parse_url doesn't return host key when schema is missing in $url.