Hello, i don't understand something, i have a js function to send something in $_SESSION with a post method, the object is sended to the $_SESSION but no dump was run in the index.php. Can you please explain me how it works ? thanks by advance

i send you the code

//index.php
<?php
session_start();
require_once "SalesByCountry.php";

if(!empty($_POST) && isset($_POST['visualQueryDataValue'])){
    $_SESSION['visualQueryFilter'] = $_POST['visualQueryDataValue'];
    var_dump($_SESSION['visualQueryFilter']);exit;
    var_dump($_SESSION, $_POST);exit;
} 
var_dump("addColumn",$_SESSION, $_POST);exit;
/* var_dump('tat');exit;*/
//var_dump($_SESSION);exit; 
$salesByCountry = new SalesByCountry;
$salesByCountry->run()->render("AddColumn");
?>

//salesByCountry.php
<?php

use \koolreport\KoolReport;
use koolreport\processes\Sort;
use koolreport\processes\Group;
use koolreport\processes\Limit;

require_once "../../koolreport/core/autoload.php";

class SalesByCountry extends Koolreport{

    use \koolreport\bootstrap4\Theme;
    //use \koolreport\inputs\Bindable;
    use \koolreport\inputs\POSTBinding;
    use \koolreport\visualquery\Bindable;

/*     protected function defaultParamValues()
    {
        return array(
            "matricule"=>array(),
        );
    }

    protected function bindParamsToInputs()
    {
        return array(
            "matricule"
        );
    } */

    public function settings(){
        return array(
            "dataSources"=>[
                /* "personnes"=>[
                    "connectionString"=>"mysql:host=eptltejprjqtr.mysql.db;dbname=eptltejprjqtr;[port=3306]",
                    "username"=>"eptltejprjqtr",
                    "password"=>"9MHzVghf",
                    "charset"=>"utf8"
                ] */
                "personnes"=>[
                    "connectionString"=>"mysql:host=localhost;dbname=db_sales",
                    "username"=>"root",
                    "password"=>"",
                    "charset"=>"utf8"
                ]
            ]
        );
    }

    public function setup(){

        if (isset($this->queryParams['visualquery1'])) {
            $vqParams =  $this->queryParams['visualquery1'];
            $queryBuilder = $this->paramsToQueryBuilder($vqParams);
            //var_dump($queryBuilder, $this->queryParams['visualquery1']);exit;
            $queryStr = $queryBuilder->toMySQL();
        } else {
            //var_dump('toto');exit;
            $queryStr = "select * from gl_personne LIMIT 100";
        }

        $this->src('personnes')
        ->query($queryStr)
        ->pipe($this->dataStore('personnes'));
    }
}

//AddColumn.view.php
<?php

use \koolreport\datagrid\DataTables;
use \koolreport\visualQuery\VisualQuery;
use \koolreport\inputs\Select2;
use koolreport\widgets\koolphp\Table;
use koolreport\widgets\google\PieChart;
?>

<div style="width:100%">
<div class="text-center">
    <h1>Camenbert</h1>
</div>


<form method="post"> 
    <input type="submit" name="button1"
            value="Button1"/> 
        
    <input type="submit" name="button2"
            value="Button2"/>
</form> 


<form method="post" id="visualForm">
    <?php
    

    VisualQuery::create(array(
        "name" => "visualquery1",
        "schema" => [
            "tables" => [
                "gl_personne"=>array(
                    "{meta}" => [
                        "alias" => "Personnes"
                    ],
                    "nom"=>array(
                        "alias"=>"nom",
                    ),
                    "codeaffniv2"=>array(
                        "alias"=>"codeaffniv2",
                    ),
                    "matricule"=>[
                        "alias"=>"matricule",
                    ]
                ),
            ],
            "relations" => [

            ]
        ]
    ))
    ?>
    <button type='submit' class='btn btn-primary' value="btnSubmit">Submit</button>
    <?php
        // print_r($this->dataStore('vqDS')->meta());
        DataTables::create(array(
            "name" => "globalTable",
            "dataSource" => $this->dataStore('personnes'),
            // "columns" => ["Quantity", "Product Name"],
            "options" => [
                "paging" => true,
                "select" => true
            ]
        ));
    ?>
</form>

<button id="btn" onclick='saveFilters()'>sauvegarder</button>

<div>
    <label for="abscisse">Choisissez un abscisse</label>
    <select name="abscisse" id="abscisse">
        <!-- <option value="nom">nom</option> -->
        <option value="codeaffniv2">codeaffniv2</option>
        <option value="matricule">matricule</option>
    </select>
    <label for="ordonne">Choisissez un ordonne</label>
    <select name="ordonne" id="ordonne">
        <option value="matricule">matricule</option>
        <option value="codeaffniv2">codeaffniv2</option>
    </select>
    <button id="btn" onclick='createChart()'>Générer un graph</button>
</div>

<div id="filters">
    <label for="matriculeNb">Choisissez un matricule</label>
    <input name="matriculeNb" type="number" id="matriculeNb">
    <label for="operator">Choisissez un opérateur</label>
    <select name="operator" id="operator">
                <option value=">">Supérieur</option>
                <option value="<">Inférieur</option>
                <option value="==">Egale</option>
    </select>
    <button id="btn-filters" onclick="applyFilters()">Appliquer le filtre</button>
    <button id="save-filter" onclick="saveFilters()">Sauvegarder le filtre</button>
    <button id="save-filter" onclick="loadFilters()">Charger le filtre</button>
</div>
<button id="save-filter" onclick="saveFilters()">Sauvegarder le filtre</button>

<select name="chartType" id="chartType">
    <option value="pie">Camembert</option>
    <option value="bar">Colonne</option>
</select>

<button id="btn" onclick='createChart()'>Générer un graph</button>
<canvas id="barChart"></canvas>

<script src="../../js/jquery"></script>
<script src="../../koolreport/chartjs/clients/Chart.min.js"></script>
<script src="../../js/saveVisualQuery.js"> </script>
</div>

//saveVisualQuery.js
function saveFilters(){
    let vqObject = $(visualquery1)
    let vqObject_data = $(visualquery1_data)
    let visualQueryDataValue = $(visualquery1_data.value)[0]



    visualQueryDataValue = {"hugo" : {"filtre1" : visualQueryDataValue}}


    console.log(visualQueryDataValue)

    $.ajax({
        method: "POST",
        url: "http://localhost/koolreport/reports/addColumn/",
        data: {visualQueryDataValue},
        error: function(XMLHttpRequest, textStatus, errorThrown) {
            alert("some error");
        }
    })
   
}