What are the potential pitfalls of using subdomains in PHP development?

One potential pitfall of using subdomains in PHP development is the risk of duplicate content being indexed by search engines, which can negatively impact SEO. To solve this issue, you can use canonical tags to specify the preferred version of the content to be indexed.

// Set canonical tag in the head section of your webpage
echo '<link rel="canonical" href="https://www.example.com/page">';