$articles = Article::where('category_id','!=',$not_category_id)->where('is_area',$is_area)->orderby('article_sort','desc')->paginate(20);

Laravel Eloquent 的条件不等于

where('id', '!=' , 2)

->whereNotIn( 'id', [2])

来自  https://www.cnblogs.com/fsong/p/5944270.html