What role does DNS configuration play in setting up subdomain redirections in PHP?

DNS configuration plays a crucial role in setting up subdomain redirections in PHP as it determines the mapping of subdomains to the correct server IP address. To redirect subdomains in PHP, you need to configure your DNS settings to point the subdomain to the correct server where your PHP code resides. Once the DNS is configured correctly, you can use PHP header function to redirect incoming requests from the subdomain to the desired location. 

<?php
// Check if the subdomain matches a specific value
if ($_SERVER['HTTP_HOST'] == 'subdomain.example.com') {
    // Redirect to a different URL
    header('Location: https://www.example.com/new-page');
    exit;
}
?>

Keywords

DNS configuration subdomain redirections PHP hosting CNAME record

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