How can PHP developers ensure that subdomain redirections are set up correctly in their applications?

To ensure that subdomain redirections are set up correctly in PHP applications, developers can use the $_SERVER['HTTP_HOST'] variable to detect the current subdomain and then redirect to the appropriate subdomain if needed. They can also use the header() function to send a 301 redirect header to the browser. 

$current_subdomain = explode('.', $_SERVER['HTTP_HOST'])[0];

if ($current_subdomain != 'www') {
    header("Location: https://www.yourdomain.com");
    exit();
}

Keywords

subdomain redirections PHP developers applications DNS settings htaccess rules

Related Questions