Like Button displaying php function and like button not working

Hi all, i don't know why im having this code displayed on the top of the like button:

<?php function wdfb_like_button_href_attribute_filter( $href ){ $href = ''; return $href; } add_filter('wdfb-like_button-href_attribute', 'wdfb_like_button_href_attribute_filter'); ?>

Also the like button stopped working.

The site is from my network:

I have deactivated the network plugin and it still display the php function on the top with the plugin deactivated.

Also i have cleared all caches from server and still not working.

Thank you