按钮点击更改div的内容

I am new to php. I want to change the content of a div on click of a button which can be set to any other text.

<div id="container">
    <b>Dear ABC,</b>

    <p>Thank You for an order. Your order #" .$row['ordNum']."</p>
    <table>
        <tbody>
        <tr>
            <th>ord_id</th>
        </tr>
        <tr>
            <td>.$row['order_id']."</td>
        </tr>
    </table>
    <p>Thank You</p>
</div>
<input type="Button" value="change"/>

I want the user to update the message content above on button click. The order is not coming from db.

How will I allow the user to edit all of the text data except orderId?

you can request the content at a file in the same directory called xyz.php

with jquery

$.ajax({
    url: 'xyz.php',
    type: 'GET',
    success: function(data){
        $('#container').html(data)
    }
})

the php file outputs some text

<?php

echo "<strong>yo</strong>";

maybe you get an idea