format_to_post deprecated

Hello,

The file wp-mpdf.php uses a deprecated hook to sanitize the_content. Somewhere around line 264, it calls
format_to_post('the_content');

FYI, format_to_post has been deprecated since WP 3.9, and hasn’t been in use for a long time before that, so it wasn’t really doing anything anyway.

My suggestion is to either get rid of that or replace it with wpdb::prepare()

Regards,
Nick

https://ww.wp.xz.cn/plugins/wp-mpdf/