Authenticating user for custom post type [closed]

No, the function current_user_can_for_blog expects a blog ID to be passed to it, not a post ID. I would change it to be like this:

if( isset( $_POST['post_type'] ) && $_POST['post_type'] != 'portfolio' ) {
    if ( !current_user_can( $post_id, 'edit_post' ) ) 
        return;
}

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