Fatal error: Call to undefined function

[neilmac]

Hello
Can anyone tell me why this breaks my site?

if (!is_mobile()) {
	function test_hook() {
	?>
<h3>Random Content Here</h3>
	<?php
	}
	add_action('genesis_before_content_sidebar_wrap','test_hook');
}

When I try it in functions.php on my localhost test site using desktop server, it works perfectly. No problem at all.
Example - http://goo.gl/IEVcPK

But when I try to use it on a live Genesis site I break the site and get: "Fatal error: Call to undefined function is_mobile()"

Any ideas?
Thanks

[SavvyJackie]

Hi,
Where is the function is_mobile() defined on the live site?

---

Web Designer and Developer at Savvy Jackie Designs | Lucky with plants | @SavvyJackie

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[neilmac]

Hi Jackie
I think I've just solved it - prodded on by you!
I think I should have used wp_is_mobile instead of is_mobile.
Or at least that seems to be working for me now.
I've been scratching my head about this for ages
The odd thing is the other way - is_mobile - is still working ok on the local site.
Anyway, I'll go with what works live. Unless anyone can see a problem with that?
Thanks very much
N.

[Author]

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