How to display the number of successful Bitrix form submissions?

Question

1C-Bitrix

There is a submission form, it has an input of the number of projects, now it displays an increasing number when the page is updated, with this script:

<?php
session_start();

$nom = isset($_SESSION["nom"]) ? intval($_SESSION["nom"] + 1) : 1;
$_SESSION["nom"] = $nom = $nom > 999 ? 999 : $nom;

echo $nom < 10 ? "00".$nom : ($nom < 100 ? "0".$nom : $nom);
?>

And I would like it to display the number of successful form submissions. Please tell me the code for such an implementation (not strong in php)
Here is an excerpt from the form:

<form id="deal_form_lk" class="sform" action="javascript:void(null);" onsubmit="send_form_lk('deal_form_lk')">
  <div class="input-group col-12 col-md-6">
                   <input id="nomerForm"  type="text" name="nomerForm" placeholder="" class="form-control" value="№ проекта: <?=substr("00".$nom, -3);?>" readonly/>
        </div>
<button id="deal_btn" type="submit"  class="modal_btn round-btn-style btn-style">Отправить</button>

Answer 1

As I understand it, it is possible to write a number to a file like this code, but I can’t integrate it in any way:
or am I mistaken?

if (isset($_POST['submit'])) {
    
    if (!file_exists('count.txt')) {
        $cnt = 1;
        $f = fopen('count.txt', 'w+');
        fwrite($f, $cnt);
        fclose($f);
    } else {
        $f = fopen('count.txt', 'r');
        $cnt = (int) fgets($f);
        fclose($f);
        $cnt++;
        $f = fopen('count.txt', 'w+');
        fwrite($f, $cnt);
        fclose($f);
    }