Test PHP $_SESSION

count.php

<?php

session_id("thomas23");

session_start();

if (!isset($_SESSION["q_num"]) ){
    $_SESSION["q_num"] = 0;
}

if (count($_POST) > 0) {
    $_SESSION["q_num"] += 1;
}

$q_num = $_SESSION["q_num"];

?>
<form action="" method="POST">
    <?= $q_num ?>
    <input type="submit" name="anything" value="Count +1">
</form>