break entire site

I tried it here: jeffsimpsonphoto.com to redirect to m.jeffsimpsonhphoto.com

it breaks the entire site the same way others have described it before me. any ideas? thx

to be more specific, it breaks the site when i check ‘redirect tablets’

Fatal error: Call to undefined function wp_is_mobile() in /home/jeffspho/public_html/wp-content/plugins/simple-mobile-url-redirect/mobile-redirect.php on line 172

Are you using WordPress 3.4 or above? The wp_is_mobile() detection plugin only works in 3.4 or higher.

I do believe I am using a version earlier than 3.4, I will have to check. Thanks for the response.

Will help if you read the plugin summary. Ozette, is it possible to extract the php code from this plugin and use it on none WordPress websites as this works really efficiently compared to any coding I have tried.

Feedback will be appreciated.

The redirect code should be able to be pulled out and used stand alone. Some of the other functionality would need to be written differently as it is based on WP.