Multi option filter from selection in laravel - development

Multi option filter from selection in laravel

I have a search form to filter out accounts to show their transactions using relations. I have it working to filter a single account. I need to create the filter multiple accounts together. Here is my code for filtering a single selection since I am ne to Laravel< I am getting stuck. Thanks in advance.

   public $relations = [];
public function account($account)
{ 
       return $this->where('account_id', $account);
}   }

from Laravel Questions and Answers https://laravelquestions.com/php/multi-option-filter-from-selection-in-laravel/
via Lzo Media