How to Extract the Domain from a URL Using PHP's parse_url()?

Domain Parsing

Extracting the domain from a URL is a common task in web development. This post explores a method for accomplishing this using the parse_url() function.

parse_url()

PHP's parse_url() function allows you to parse a URL into its individual components. It returns an array containing information such as the scheme, host, port, path, query string, and fragment.

To extract the domain from a URL using parse_url(), you need the host component. Here's an example:

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

The resulting host component will be the domain of the URL, including the subdomain if there is one. This behavior holds true for both the www and non-www versions of a domain.

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

$url = 'http://google.co.uk/dhasjkdas/sadsdds/sdda/sdads.html';
$parse = parse_url($url);
echo $parse['host']; // prints 'google.co.uk'

Note: parse_url() assumes the URL is well-formed. It may not handle malformed URLs gracefully.

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