How to Extract a Subdomain from a URL in PHP?

Extracting Subdomain from a URL in PHP

Identifying the subdomain of a URL can be useful for various purposes, such as content localization or domain validation. PHP provides a straightforward method for retrieving the subdomain.

To obtain the subdomain part, you can employ the explode() function to split the URL host into an array based on periods. The first element of this array will represent the subdomain.

Example:

To extract the "en" subdomain from "en.example.com":

$subdomain = array_shift((explode('.', 'en.example.com')));
echo $subdomain; // Output: "en"

Alternative Method (PHP 5.4 ):

In PHP versions 5.4 and later, you can simplify the code using array destructuring:

[$subdomain] = explode('.', 'en.example.com');
echo $subdomain; // Output: "en"

By utilizing either of these techniques, you can efficiently extract the subdomain from any given URL in PHP.

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