Redirect loop when forwarding to mobile site

Question

I have successfully redirected my page to m.example.com from example.com when i open in mobile environment with this code in functions.php

add_action('template_redirect', 'redirecting_to_mobile_site');
function redirecting_to_mobile_site(){
$requri = $_SERVER['REQUEST_URI'];

 if( wp_is_mobile() )
 {
  $redcont = "http://m.example.com".$requri;
  wp_redirect( $redcont, 301 ); exit;
 }
}

I also created a sub-domain through WP sub-domain plugin.

But when I click any link from index page it says "This page has redirect loop"

Please advise how to enable sub-domain for internal pages.

Thank you.

Answer 1

You need to check that you aren't already on the mobile site:

function redirecting_to_mobile_site() {
    if ( $_SERVER['SERVER_NAME'] !== 'm.example.com' && wp_is_mobile() ) {
        wp_redirect( 'http://m.example.com' . $_SERVER['REQUEST_URI'], 301 );
        exit;
    }
}

add_action( 'template_redirect', 'redirecting_to_mobile_site' );

You'll need to clear your browser cache to properly test the fix.