How check if a post is saved from backend or frontend?

Question

I created a custom post type called wasb_contact which can be inserted and edited both from the backend and from the frontend (through a form I created). The CPT has some custom meta fields which are saved by a function called wasb_contact_save_postdata and invoked by the save_post_{$post->post_type} hook. I would like this function to be invoked only when the CPT is created or modified from the backend and not also when it is created or modified from the frontend.

How can I do?

Answer 1

I would add some hidden input field to frontend form, and check for its presence in the save_post hook.

...
<input type="hidden" name="saved-on-frontend" value="1">
...

And then check for it in that hooked function:

function my_save_hook() {

    if( isset( $_POST['saved-on-frontend'] ) ) {
        return; // don't do anything ... 
    }

}
add_action( 'save_post_CUSTOM_POST_TYPE', 'my_save_hook' );