How to return ajax request response from PHP file with 'return' keyword instead of 'echo' ?

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PHP

jQuery

I want to return requested data which included form elements with array name like name="desc[]" and so on when I echo result from php file it gives error "Notice: Array to string conversion", so how to overcome this issue? I am appending the response in table tbody onclick

What I have tried:

My ajax call

  $.ajax({
    type: "POST",
    url: "ajaxRequests/createVrEntriesRows.php",
    data: "form_data=" + form_data +"&rows=" + rows,
    success: function(response){

        $('#VR_Entries').append(response);

    }
});

My Php file

<?php 

  require_once '../controllers/conn.php'; 

		if(isset($_POST["form_data"])){

			extract($_POST);

			$parts = explode('/', $domain_class);

			$class = isset($parts[0])?$parts[0]:'';
			$sub_class = isset($parts[1])?$parts[1]:'';
			$domain = isset($parts[2])?$parts[2]:'';

			$sr_no = $_POST['rows']+1;

			return '<tr>
                    <td>
                        <input type="hidden" name="sr_no[]" value="'.$sr_no.'">'.$sr_no.'
                    </td>
                    <td>
                        <input type="hidden" name="job[]" value="'.$job.'">'.$job.'
                    </td>
                    <td>
                        <input type="hidden" name="account[]" value="'.$account.'">'.$account.'
                    </td>
                    <td>
                        <input type="hidden" name="class[]" value="'.$class.'">'.$class.'
                    </td>
                    <td>
                        <input type="hidden" name="sub_class[]" value="'.$sub_class.'">'.$sub_class.'
                    </td>
                    <td>
                        <input type="hidden" name="domain[]" value="'.$domain.'">'.$domain.'
                    </td>
                    <td>
                        <input type="hidden" name="desc[]" value="'.$description.'">'.$description.'
                    </td>
                    <td class="debit">
                        <input type="hidden" name="debit[]" value="'.$debit.'">'.$debit.'
                    </td>
                    <td class="credit">
                        <input type="hidden" name="credit[]" value="'.$credit.'">'.$credit.'
                    </td>
                     <td>
                        <button type="button" class="btn" onclick="DeleteRowFunction(this)">x</button>
                        <button type="button" class="btn">
                            
                        </button>
                     </td>
                  </tr>';
		}

?>