Price range filter using CodeIgniter4

I am trying to create a search with multiple filters, one of the filters is a budget or price filter and I am using dropdown instead of creating a price range bar.

In other words, my budget filters are:-

• 0-2500000
• 250000-500000
• 500000-10000000
• 10000000-25000000
• 25000000-50000000
• 50000000 and above

Here is my code and I need help modifying it. The function in Controller and SQL Query in the model only takes a single budget (price) value and displays the result, instead of taking the budget (price) range and showing the result which comes under that budget (price) range.

What I want to achieve is that when the user selects the budget (price) range in the search form, it should display properties that fall under the selected budget range or price range.

HTML Form

    <div class="search__area-inner">
                <?= form_open('/home/search_residential'); ?>
                <div class="row">
                    <div class="col-12"><?= csrf_field(); ?></div>
                    <div class="col-6 col-lg-4 col-md-4">
                        <div class="form-group">
                            <select name="budget[]" class="wide select_option">
                                <option data-display="Select Budget">Select Budget</option>
                                <option value="0-2500000">less than 25 lacs</option>
                                <option value="250000-500000">25 to 50 lacs</option>
                                <option value="500000-10000000">50 lacs to 1 cr</option>
                                <option value="10000000-25000000">1 cr to 2.5 cr</option>
                                <option value="25000000-50000000">2.5 cr to 5 cr</option>
                                <option value="50000000">5 cr +</option>
                            </select>
                        </div>
                    </div>
                    <div class="col-6 col-lg-4 col-md-4">
                        <div class="form-group">
                            <select name="type" class="wide select_option">
                            <option data-display="Select Property Type">Select Property Type</option>
                            <option value="Apartments">Apartments</option>
                            <option value="Bungalow">Bungalow</option>
                            <option value="Row House">Row House</option>
                            <option value="Villas">Villas</option>
                            </select>
                        </div>
                    </div>
                    <div class="col-6 col-lg-4 col-md-4">
                        <div class="form-group">
                        <input type="text" class="form-control" id="inputLocation" name="city" value="" placeholder="Enter City" required>
                        </div>
                    </div>
                    <br>
                    <div class="mx-auto">
                        <div class="form-group">
                            <button class="btn btn-primary text-uppercase btn-block"> search 
                                <i class="fa fa-search ml-1"></i>
                            </button>
                        </div>
                    </div>
                </div>
                <?= form_close(); ?>
            </div>

Controller code

    public function search_residential() {

        $data['getfooter'] = $this->homeModel->getFooterInfo();
        $data['getad'] = $this->homeModel->getCarousel();
        $data['pagelist'] =  $this->pageModel->getPages();
        $data['cities'] = $this->db->table('tblcity')->select('*')->get()->getResult(); 


        $params = array(

                'budget' => $this->request->getVar('budget'),
                'type' => $this->request->getVar('type'),
                'city' => $this->request->getVar('city'),
                          
                );

        $data['search'] = $this->homeModel->getSearch($params);     

        return view('searchresidential', $data);
    }

**Model code**

    //Searching residential data
    public function getSearch($params) {

        
        $budget = $params['budget'];
        $type = $params['type'];
        $city = $params['city'];

        $builder= $this->db->table('tblresidential');
        $builder->select('*');
        $builder->where('1 = 1');

        if ($budget != '') {

            $builder->where('budget', $budget);

        }
        if ($type != '') {

            $builder->where('type', $type);

        }
        if ($city != '') {

            $builder->where('city', $city);

        }

        return $builder->get()->getResult();
        
    }