Retrieve and display json data from codeigniter function

How can to display data from database (SQL) using ajax (json) and codeigniter or php? i've tried to do it but the result is "undefined" here is my code:

How can to display data from database (SQL) using ajax (json) and codeigniter or php? i've tried to do it but the result is "undefined" here is my code:

jquery codes:

$('[id^="menuitem_"]').on('click',function(){
var menuID = $(this).attr('id').split("_")[1];
        $.ajax({
            url:"<?php echo base_url();?>Vendors_search/Get_Business_By_Type",
            method:"POST",
            dataType: "text",
            data: {menuID:menuID},
            success:function(resp){

              var obj = $.parseJSON(resp);
              var values = Object.values(obj); 
              $.each(obj,function(key,val){

              $('.business_id').append('<strong>' + val.business_name + '</strong>');
            });
    }

        });

Codeigniter codes:

function Get_Business_By_Type(){
    $obj = $this->input->post('menuID');     
    if($this->Search_obj_model->getBusinessType($obj)){
    $bus_type = $this->Search_obj_model->getBusinessType($obj);  
    $result['business_details'] = $this->Search_obj_model->getBusinessType($obj);
        }
        else{
            $result['message'] = 'Oooops! We could not find your request. Try again later';
        }
    $this->output->set_content_type('application/json');
    $this->output->set_output(json_encode($result));
    $string = $this->output->get_output();
    echo $string;
    exit();
 }

how to build a new json string from existing json string

I have multiple files that contain json data that looks like this:

I have multiple files that contain json data that looks like this:

1.json:

[{
    "id": 2100059,
    "email": "",
    "company": "acme",
    "job_title": "",
    "first_name": "Jane",
    "last_name": "Doe"
 }, 
 {
    "id": 2199991,
    "email": "",
    "company": "Widgets Inc",
    "job_title": "",
    "first_name": "John",
    "last_name": "Doe"
 }]

2.json:

[{
    "id": 123456,
    "email": "",
    "company": "acme",
    "job_title": "",
    "first_name": "GI Jame",
    "last_name": "Adf"
 }, 
 {
    "id": 000001,
    "email": "",
    "company": "Widgets Inc",
    "job_title": "",
    "first_name": "bob",
    "last_name": "billy"
 }]

How can I combine these two lists so that it's just one string, with one set of []?

So far, I'm writing the logic read in the contents of each file into separate strings. But then I'm thinking I should: 1. json_decode() each string to treat it like an object

Not sure how to append to the object though. any tips would be appreciated.

EDIT 1

I decided to read each file contents into an array, and then try the tips suggested below to use array_merge. when i do a print_r on my array, it looks like this: (bogus data, but you should get the idea)

Array
(
    [0] => [{"id":2100059,"email":"","company":""},{"id":2129527,"email":"","company":""},{"id":2134804,"email":"","company":""},{"id":2148239,"email":"","company":""}]
    [1] => [{"id":2100059,"email":"","company":""},{"id":2129527,"email":"","company":""},{"id":2134804,"email":"","company":""},{"id":2148239,"email":"","company":""}]
[2] =&gt; [{"id":2100059,"email":"","company":""},{"id":2129527,"email":"","company":""},{"id":2134804,"email":"","company":""},{"id":2148239,"email":"","company":""}
[3] =&gt;[{"id":2100059,"email":"","company":""},{"id":2129527,"email":"","company":""},{"id":2134804,"email":"","company":""},{"id":2148239,"email":"","company":""}]

)

And then this is the logic I have that tries to combine all this into one json string:

    print_r($allpages);
$finaljsonstring ='';
foreach ($allpages as $item)
{
$finaljsonstring = $finaljsonstring + json_encode(array_merge(json_decode($item)));
}
echo $finaljsonstring;

But something is going wrong. (I'm calling this as ajax so it's hard to debug) but when i console.log the results from the ajax call, nothing is returned. Ultimately, what I need to return to the front end is a single array of json strings like this:

[{}, {},{}]

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