get_the_terms inside save_post gives old terms

This issue shouldn’t happen if you’re using the classic editor, however, if you’re using the block/Gutenberg editor which uses the REST API, then that issue can be fixed by using the wp_after_insert_post hook instead. Excerpt from https://make.wordpress.org/core/2020/11/20/new-action-wp_after_insert_post-in-wordpress-5-6/: The new action wp_after_insert_post has been added to WordPress 5.6 to allow theme and plugin developers to run … Read more

My custom title gets duplicated at every save or post update

First of: Your custom title suffix getting duplicated might not be what you want to happen, but is expected behavior as per your code sample. The save_post action hook runs everytime a post (or page) is created or updated. Hence your callback runs everytime. Let me offer two solutions: 1 Use the wp_insert_post action instead … Read more

How to extend the page editor?

I think the batter way is to use plugin. Check this : http://wordpress.org/extend/plugins/search.php?q=form&sort= I personally suggest you Contact Form 7 Just past form plugin short code in your page/post , that’s it ! Cheers !

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