我如何获得传递使用id获取元素，而不是$ _POST ['']的名称

I'm trying to get the data by $_POST[''] but i need to get it by id. How can i do that?

I tried $_POST['#id']

I want PHP to receive the data from the element:

<div id="phone">+256785589992</div>

you can use javascript and a hidden input with php and submit the form using the input name

 <script>
        document.querySelector("input-hidden").value = document.querySelector("phone").innerHTML;
    </script>