PHP Form Submission: "false" not passed in

I have a form that inserts user input into a MySQL database, and one of the input field has a Boolean value. It works fine when the value is true, however if the value is false, my 'echo' and database can't receive that value at all. I really have no idea what's happening. Please take a look at my code below: HTML:

                <label>
                  <input type="checkbox" id="consentForEmail" name="consentForEmail" />&nbsp;
                  <span class="wpcf7-list-item-label">By clicking this button I agree to receive emails from us</span>
                </label>

JavaScript for collecting and setting the value:

    var _this = '#consentForEmail';

    $('#consentForEmail').change(function(){
      var checked = $('#consentForEmail').prop('checked');
      $(_this).val(checked);
      console.log( $('#consentForEmail').val() );
    });

And finally, PHP for collecting form data:

$receive_email = $_POST["consentForEmail"];
echo "<li>$receive_email</li>"

Thank you!