Sujet : problème ajout resultats dans base de données mysql

Bonjour je crée un exercice de calcul mental en javascript/php/mysql et je n'arrive pas à enregistrer mes résultats dans la base de données mysql

Voici mes codes :

index2.php

<!doctype html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <title>Calcul mental</title>
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/foundation.min.css">
    <script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
  
    <div class="row">
        <h1>Calcul Mental</h1>
        <div class="columns large-12">
            <h2>Quel est le résultat de ? </h2>
            <div class="columns large-6">
                <form class="mental_form2" action="calcul.php">
                    <div class="columns large-4">
                        <input class="champ" type="text" name="n1" id="n1">
                    </div>
                    <div class="columns large-4">
                        <input class="champ" type="text" name="si1" id="si1">
                    </div>
                    <div class="columns large-4">
                        <input class="champ" type="text" name="n2" id="n2">
                    </div>
                    <div class="columns large-4">
                        <label for="reponse">Votre réponse</label>
                    </div>
                    <div class="columns large-4">
                        <input type="text" name="result" id="result">
                    </div>
                    <div class="columns large-4">
                        <input type="submit" name="submit" id="submit" value="Valider" class="button small right">
                    </div>
                </form>
            </div>
            <div class="columns large-6 res">
                  
            </div>
        </div>
    </div>
    <span id="chronotime">0:00:00:00</span>
    <script src="js/api.js"></script>
</body>
</html>

api.js

startTime = 0
var start = 0
var end = 0
var diff = 0
var timerID = 0
function chrono(){
    end = new Date()
    diff = end - start
    diff = new Date(diff)
    var msec = diff.getMilliseconds()
    var sec = diff.getSeconds()
    var min = diff.getMinutes()
    var hr = diff.getHours()-1
    if (min < 10){
        min = "0" + min
    }
    if (sec < 10){
        sec = "0" + sec
    }
    if(msec < 10){
        msec = "00" +msec
    }
    else if(msec < 100){
        msec = "0" +msec
    }
    document.getElementById("chronotime").innerHTML = hr + ":" + min + ":" + sec + ":" + msec
    timerID = setTimeout("chrono()", 10)
}
  
function chronoStop(){
    clearTimeout(timerID)
}
function chronoContinue(){
    start = new Date()-diff
    start = new Date(start)
    chrono()
}
  
function chronoStart(){
    start = new Date()
    chrono()
}
  
function init(){
    var n1 = 1 + Math.floor(Math.random() * 10);
    var si1 = '+';
    var n2 = 1 + Math.floor(Math.random() * 10);
    $('#n1').val(n1);
    $('#si1').val(si1);
    $('#n2').val(n2);
}
function success(){
    $('.res').html('<div data-alert class="success alert-box">Bien joué ! <a href="#" class="close">&times;</a></div>');
}
function error(){
    $('.res').html('<div data-alert class="alert alert-box">Dommage ! même joueur joue encore ! <a href="#" class="close">&times;</a></div>');  
}
function send(){ 
                  
        $('.mental_form2').submit(function() {
        $.post('calcul.php', { n1: $('.mental_form2 input[name=n1]').val(),
                        si1: $('.mental_form2 input[name=si1]').val(),
                    n2: $('.mental_form2 input[name=n2]').val(),
                    result: $('.mental_form2 input[name=result]').val()
                    }
                );
                return false; 
            });
}
function check(){
    var n1 = $('#n1').val();
    var si1 = $('#si1').val();
    var n2 = $('#n2').val();
    var r1 = parseInt(n1) + parseInt(n2);
    var r2 = $('#result').val();
    if( r1 == r2){
        send();
        success();
    }else{
        error();
    }
    $('#result').val('');
}
$(document).ready(function(){
    init();
    chronoStart();
})
$('#submit').click(function(event){
    event.preventDefault();
    check();
    init();
})

calcul.php

<?php
session_start();
// set error reporting level
if (version_compare(phpversion(), '5.3.0', '>=') == 1)
  error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED);
else
  error_reporting(E_ALL & ~E_NOTICE);
    
require_once('classes/CMySQL.php');
require_once('classes/Ccalcul.php');
  
  
if ($_SESSION['member_id'] && $_SESSION['member_status'] == 'active' && $_SESSION['member_role'])
  
{
    $sChiffre1 = $GLOBALS['MySQL']->escape($_POST['n1']);
    $sSigne1 = $GLOBALS['MySQL']->escape($_POST['si1']);
    $sChiffre2 = $GLOBALS['MySQL']->escape($_POST['n2']);
    $sVotresultat = $GLOBALS['MySQL']->escape($_POST['result']);
      
    if ($sChiffre1 && $sSigne1 && $sChiffre2 && $sVotresultat) 
      
            {
                $Accept2 = $GLOBALS['Ccalcul']->acceptcalcul();
            }
}
echo (file_get_contents('templates/index2.php'));
  
?>

Ccalcul.php

<?php
  
class Ccalcul {
  
    function Ccalcul() {}
      
    // Accept votresultat
      
    function acceptcalcul() 
        {
              
            $sChiffre1 = $GLOBALS['MySQL']->escape($_POST['n1']);
            $sSigne1 = $GLOBALS['MySQL']->escape($_POST['si1']);
            $sChiffre2 = $GLOBALS['MySQL']->escape($_POST['n2']);
            $sVotresultat = $GLOBALS['MySQL']->escape($_POST['result']);
  
        if ($sChiffre1 && $sSigne1 && $sChiffre2 && $sVotresultat) 
      
            {
                $bRf = $GLOBALS['MySQL']->res("INSERT INTO `addition` SET 
                    `chiffre1` = '{$sChiffre1}',
                    `signe1` = '{$sSigne1}',
                    `chiffre2` = '{$sChiffre2}',
                    `votresultat` = '{$sVotresultat}'
                      
                    ");
                      
            }
        }
          
}
$GLOBALS['Ccalcul'] = new Ccalcul();

CMySQL.php

<?php
 
class CMySQL {
 
    // variables
    var $sDbName;
    var $sDbUser;
    var $sDbPass;
 
    var $vLink;
 
    // constructor
    function CMySQL() {
        $this->sDbName = 'site3';
        $this->sDbUser = 'root';
        $this->sDbPass = '';
 
        // create db link
        $this->vLink = mysql_connect("localhost", $this->sDbUser, $this->sDbPass);
 
        //select the database
        mysql_select_db($this->sDbName, $this->vLink);
 
        mysql_query("SET names ISO-8859-1");
    }
 
    // return one value result
    function getOne($query, $index = 0) {
        if (! $query)
            return false;
        $res = mysql_query($query);
        $arr_res = array();
        if ($res && mysql_num_rows($res))
            $arr_res = mysql_fetch_array($res);
        if (count($arr_res))
            return $arr_res[$index];
        else
            return false;
    }
 
    // executing sql
    function res($query, $error_checking = true) {
        if(!$query)
            return false;
        $res = mysql_query($query, $this->vLink);
        if (!$res)
            $this->error('Database query error', false, $query);
        return $res;
    }
 
    // return table of records as result in pairs
    function getPairs($query, $sFieldKey, $sFieldValue, $arr_type = MYSQL_ASSOC) {
        if (! $query)
            return array();
 
        $res = $this->res($query);
        $arr_res = array();
        if ($res) {
            while ($row = mysql_fetch_array($res, MYSQL_ASSOC)) {
                $arr_res[$row[$sFieldKey]] = $row[$sFieldValue];
            }
            mysql_free_result($res);
        }
        return $arr_res;
    }
 
    // return table of records as result
    function getAll($query, $arr_type = MYSQL_ASSOC) {
        if (! $query)
            return array();
 
        if ($arr_type != MYSQL_ASSOC && $arr_type != MYSQL_NUM && $arr_type != MYSQL_BOTH)
            $arr_type = MYSQL_ASSOC;
 
        $res = $this->res($query);
        $arr_res = array();
        if ($res) {
            while ($row = mysql_fetch_array($res, $arr_type))
                $arr_res[] = $row;
            mysql_free_result($res);
        }
        return $arr_res;
    }
 
    // return one row result
    function getRow($query, $arr_type = MYSQL_ASSOC) {
        if(!$query)
            return array();
        if($arr_type != MYSQL_ASSOC && $arr_type != MYSQL_NUM && $arr_type != MYSQL_BOTH)
            $arr_type = MYSQL_ASSOC;
        $res = $this->res ($query);
        $arr_res = array();
        if($res && mysql_num_rows($res)) {
            $arr_res = mysql_fetch_array($res, $arr_type);
            mysql_free_result($res);
        }
        return $arr_res;
    }
 
    // escape
    function escape($s) {
        return mysql_real_escape_string(strip_tags($s));
    }
 
    // get last id
    function lastId() {
        return mysql_insert_id($this->vLink);
    }
 
    // display errors
    function error($text, $isForceErrorChecking = false, $sSqlQuery = '') {
        echo $text; exit;
    }
}
 
$GLOBALS['MySQL'] = new CMySQL();

Merci de m'éclairer