How Can I Extract the Subdomain from a URL in PHP?

Retrieving the Subdomain from a URL in PHP

When working with URLs, it's often necessary to extract specific parts such as the subdomain. In PHP, you can achieve this effortlessly using a built-in function.

Solution

To obtain the subdomain of a URL, you can leverage the following code:

array_shift((explode('.', $_SERVER['HTTP_HOST'])));

This function effectively separates the parts of the domain into an array using the dot (.) as the delimiter. The "array_shift" function then retrieves the first element of the array, which represents the subdomain.

For example, given the URL "en.example.com", the code will extract the "en" portion.

Alternative Syntax

In PHP 5.4 and later, you can utilize a more concise syntax to achieve the same result:

explode('.', 'en.example.com')[0];

This syntax simplifies the process by directly indexing the resulting array.

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