Can't use the function in php

Thanks for providing such a fantastic plugin.
Let me first say that I’m not a very beginner at web development. So pardon my silly questions. I’ve been trying to call the function in the php code.

I tried to use the following code to test whether the code detects a phone or a desktop

<?php if (function_exists(‘wpmd_is_phone’) && wpmd_is_phone()) :?>
This will show if there is a phone
<?php else : ?>
This will show if it is anything but a phone
<?php endif; ?>

The above code works. However, as soon as I try to put an ad in between, in doesn’t work anymore. I suspect because is uses javascript and I have no clue about javascript.

Here is the code I’m using (it displays criteo ads with a fallback on adsense)

<?php if (function_exists(‘wpmd_is_phone’) && wpmd_is_phone()) :?>

<script type=’text/javascript’>
<!–//<![CDATA[
document.MAX_ct0 =”;
var m3_u = (location…….
…..
//]]>–></script>

<?php else : ?>

Another ad

<?php endif; ?>

The above code doesn’t work. I tried to put a ‘ before the script but it wouldn’t work.

Any help would be much appreciated!

https://www.ads-software.com/plugins/wp-mobile-detect/