Rule which ensures the field under validation is required if another field is accepted

You can use required_if_accepted validation rule which ensures the field under validation is required if another field is accepted (a value of yes, on, 1, or true).

Validator::make([
     'is_company' => 'on',
     'company_name' => 'Apple',
], [
     'is_company' => 'required|boolean',
     'company_name' => 'required_if_accepted:is_company',
]);

Tip given by @iamgurmandeep