$_POST is empty, form

$_POST is empty before form, I don’t know why.

        <form method = "POST">
        <div class = "formDiv">
            <label for="name">name</label>
            <input class="name" id="name">
        </div>
        <div class = "button1">
            <input type="submit" value="submit">
        </div>
    </form>

PHP:

var_dump($_POST);

>Solution :

your fields require name attribute

   <form method = "POST">
        <div class = "formDiv">
            <label for="name">name</label>
            <input name ="name" class="name" id="name">
        </div>
        <div class = "button1">
            <input type="submit" name="submit" value="submit">
        </div>
    </form>