Query Builder "Where" with Array

I have been able to achieve desired result. It was easier than I thought actually   My code looks like this now:

Code:

$this->where('catalog', $category);
unset($postFilters['page']);
foreach ($postFilters as $key => $value) {
  $this->whereIn($key, $value);
}
return $this->paginate(4)

At first I tried to use $postFilters as $key. But it didn't work because $key is an array. Then I found out that if I use $postFilters as $key => $value, the same $key becomes a string and can be used as a column name in my query.
I am also using pagination, and it appeared that page is also part of $postFilters, so I got error when tried to go to the second page. But unset($postFilters['page']) fixes that nicely.