php - remove_meta_box wordpress function doesn't exists

Question

I'm trying to remove category meta box from post. I've always error :

Fatal error: Uncaught Error: Call to undefined function remove_meta_box()

When i Try the following code, that display "No cool"

if (function_exists( 'remove_meta_box' ) ) {
    die('cool');
}else{
    die('No cool');
}

I deduce remove_meta_box function doesn't exist ?

I've try the following code

function remove_my_post_metaboxes() {
    remove_meta_box('categorydiv’','post','side');
}
 add_action('admin_head','remove_my_post_metaboxes');

But it not working too. I'm working with wp 5.5. I think there is nicer solution than display:none in CSS

question from:https://stackoverflow.com/questions/65832518/remove-meta-box-wordpress-function-doesnt-exists

Answer 1

Waitting for answers