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hello I'm trying to make my page more dynamic and I want to array_push broodjes_ID into my array $_SESSION['basket']; how do I do this? I'm a little confused because I aldo have html code in there for the styling and I don't wanna mess that up

<!-- session_start();  geeft error a sessin has already started -->
ini_set('display_errrors', '1');
<!DOCTYPE html>
<html lang="en">
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
        <meta name="description" content="" />
        <meta name="author" content="" />
        <title>Shop Homepage - Start Bootstrap Template</title>
        <!-- Favicon-->
        <link rel="icon" type="image/x-icon" href="assets/favicon.ico" />
        <!-- Bootstrap icons-->
        <link href="" rel="stylesheet" />
        <!-- Core theme CSS (includes Bootstrap)-->
        <link href="css/styles.css" rel="stylesheet" />
        <link href="css/stylecart.css" rel="stylesheet" />
        <script src="js/scripts.js" async></script>

        body {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 20px;

        #myBtn {
        display: none;
        position: fixed;
        bottom: 20px;
        right: 30px;
        z-index: 99;
        font-size: 18px;
        border: none;
        outline: none;
        background-color: black;
        color: white;
        cursor: pointer;
        padding: 25px;
        border-radius: 50px;

        #myBtn:hover {
        background-color: #555;
        <!-- Navigation-->
        <?php include "navbar.php"?>
            $_SESSION['basket'] = array(); // dit is nu hard coded en moet je ervoor zorgen dat hij dit kan toevoegen als het op de knop word gedrukt
        <?php if(isset($_SESSION['USER_ID'])){ ?>
        <!-- Header-->
        <header class="bg-dark py-5">
            <div class="container px-4 px-lg-5 my-5">
                <div class="text-center text-white"> <!--Het werkt -->
                    <h1 class="display-4 fw-bolder">Goedemorgen, <?php echo $_SESSION['USERNAME'];?></h1>
                    <p class="lead fw-normal text-white-50 mb-0">Shop in style</p>
        } else {
                <!-- Header-->
                <header class="bg-dark py-5">
            <div class="container px-4 px-lg-5 my-5">
                <div class="text-center text-white"> <!--het werkt-->
                    <h1 class="display-4 fw-bolder">Goedemorgen, Gast</h1>
                    <p class="lead fw-normal text-white-50 mb-0">Shop in style</p>
        <?php } ?>
        <!--miscchien dit toch in een whileloop gooien dat zal ook de code korter maken-->
        <!-- Section-->
        <button onclick="topFunction()" id="myBtn" title="Go to top">↑</button> 
        include "config.php";
        $sql  = 'SELECT * FROM broodjes';
        $stmt = $conn->prepare($sql); 
        $result = $stmt->get_result(); // get the mysqli result
        while($row = $result-> fetch_assoc()){
            $data = array();
            //echo $row['broodnaam'];
            echo '        <section class="py-5">
            <div class="container px-4 px-lg-5 mt-5">
                <div class="row gx-4 gx-lg-5 row-cols-2 row-cols-md-3 row-cols-xl-4 justify-content-center">
                    <div class="col mb-5">
                        <div class="card h-100">
                            <!-- Product image dit kan later nog wel-->
                            <div class="fw-image">
                                <img class="card-img-top" src="" alt="..." />
                            <!-- Product details-->
                            <div class="card-body p-4">
                                <div class="text-center">
                                <div class="testing">
                                    <h5 class="broodjes_id" hidden>'.$row['broodjes_ID']. '</h5>
                                    <!-- Product name-->
                                    <div class="testing">
                                        <h5 class="fw-bolder">'.$row['broodnaam']. '</h5>
                                    <!-- Product price-->
                                    <div class="test2">
                                        <h3> Prijs:  </h3>   <h3 class="fw-price"> €'.$row['prijs']. '</h3><br>
                                    '; if($row['voorraad'] == 0){
                                        echo '
                                        <h3 class="fw-voorraad" style="color: red;"> uitverkocht</h3><br>
                                    '; }else{ echo ' 
                                        Voorraad: '.$row['voorraad'].'<br>
                                        <!-- Product actions-->
                                        <div class="card-footer p-4 pt-0 border-top-0 bg-transparent">
                                        <form action="array.php" method="post">
                                            <div class="text-center"><button class="btn btn-outline-dark mt-auto shop-item-button" type="submit" name="add_to_cart" method="post">Add to cart</button></div>
                                    '; } 
                        echo '</div>
        // when button clicked array_push to $_SESSION['basket'] not working
                array_push($_SESSION['basket'], $row['broodjes_ID']);


What I have tried:

tried asking teachers. they don't know
tried google but when I ask something about shopping carts I just get a bunch of javascript and I don't wanna use that.
Updated 14-Dec-21 4:12am

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