PHP insert an order in a table with all the prizes - php

Question

I'm making a shop as a work for school and I have to add into a database the selections of the customer.
The insert is ok, however, in the CommandeTotal column, the prize is only the one of the last item I choose (I choose 2 or more products who have different prize), here's my code to understand my problem:
The instruction for add into the table Commandes is ok.
The problem is when it's time to do the insert instruction for add into the table commandeDetails, the products are all inserted, but the prize for all the products in the table after the insert instruction is from the last product.
<?php
if (empty($_SESSION["achats"]))
echo "Votre panier est Vide!";
else {
//afficher les éléments du panier
$mysqli = new mysqli("localhost", "root", "", "magasin");
mysqli_set_charset($mysqli, "utf8");
if (isset($_POST["PasserCommande"])) {
//0) Pogner le ID du user logué
if(isset($_SESSION["nom"]))
{
$queryUser = "SELECT MAX(UserID) AS No FROM Users WHERE UserName = '".$_SESSION["nom"]."'";
$resultUser = $mysqli->query("$queryUser");
$UserID = $resultUser->fetch_assoc()["No"];
//1) Ajouter une commande(enlever CommandeID dans la requête)
$queryOrder = "INSERT INTO commandes(UserID, CommandeDate) VALUES('".$UserID."', CURRENT_TIMESTAMP())";
$mysqli->query($queryOrder);
//2) Pogner le ID de la commande
$queryOrderID = "SELECT MAX(CommandeID) AS id FROM commandes";
$result = $mysqli->query($queryOrderID);
$orderID = $result->fetch_assoc()["id"];
echo"<h3>Résultat de votre commande : </h3>";
echo "Commande # " . $orderID . " enregistrée.";
//3) Ajouter des détails
while ($element = each($_SESSION["achats"])) {
if(isset($_SESSION["prix"]))
{
$queryOrderDetail = "INSERT INTO detailcommande(CommandeID, ProduitID, CommandeTotal, CommandeDate) VALUES('".$orderID."','".$element["key"]."', '".$_SESSION["prix"]."', CURRENT_TIMESTAMP())";
$mysqli->query($queryOrderDetail);
echo $queryOrderDetail;
}
}
unset($_SESSION["achats"]);
}
}
if (isset($_SESSION["achats"])) {
$total = 0;
echo"<h3>Vos achats de la journée : </h3>";
while ($element = each($_SESSION["achats"])) {
$query = "SELECT * FROM produits WHERE ProduitID = '" . $element["key"] . "'";
$result = $mysqli->query($query);
$ligne = $result->fetch_assoc();
echo"<div class='col-sm-4 col-lg-4 col-md-4'>
<div class='thumbnail'>
<div class='caption'>";
echo"<img src='IMAGES/max/$ligne[ProduitLien]' width='100' height='50' />
<h4 class='pull-right'>$ligne[ProduitPrix]$</h4>
<h5><a href='#'>$ligne[ProduitNom]</a></h5>
<h6>Qté : $element[value]</h6>
</div>
<div class='ratings'>
<p>
<span class='glyphicon glyphicon-star'></span>
<span class='glyphicon glyphicon-star'></span>
<span class='glyphicon glyphicon-star'></span>
<span class='glyphicon glyphicon-star'></span>
<span class='glyphicon glyphicon-star'></span>
</p>
</div>
</div>
</div>";
$total += $element["value"] * $ligne["ProduitPrix"];
$_SESSION["prix"] = $ligne["ProduitPrix"];
}
echo "<div>total : <strong>" . $total . "$</strong></div>";
echo "<div>total après taxes <strong>: " . round($total * 1.15,2) . "$</strong></div>";
}
$mysqli->close();
}
?>
<form method="POST" action="#">
<input type="submit" name="PasserCommande" value="Commandez maintenant" />
</form>

Answer 1

Based on the information you provided, I can only think of the following :
$_SESSION["achats"] is a array and isset($_SESSION["prix"]) is NOT(or having only 1 value)
For example, you have:
$_SESSION["achats"] = array( '1' => '1', '2' => '2');
$_SESSION["prix"] = "65"
Please provide more code, perhaps your input if this is not what you after.

Answer 2

I've sold the problem, I added this and it's working :
while ($element = each($_SESSION["achats"])) {
$queryTest = "SELECT ProduitPrix FROM produits WHERE ProduitID = ". $element["key"];
$res = $mysqli->query($queryTest);
while($prixCommandes = $res->fetch_assoc())
{
$queryOrderDetail = "INSERT INTO detailcommande(CommandeID, ProduitID, CommandeTotal, CommandeDate) VALUES('".$orderID."','".$element["key"]."', '".$prixCommandes["ProduitPrix"]."', CURRENT_TIMESTAMP())";
$mysqli->query($queryOrderDetail);
}
}
Thank you for trying to help me