Wybieranie danych z bazy danych za pomocą php

Dzień dobry mam taką stronę w arkuszu php:

<?php
    session_start();
    @include 'includes/connect.php';

    $sql = "SELECT product_id, product_img FROM produkty LIMIT 16";
    $result = $connect->query($sql);
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>MangaBox</title>
    <link rel="stylesheet" href="css/style.css">
    <link rel="icon" type="image/x-icon" href="images/icon.png">
    <link href='https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css' rel='stylesheet'>
    
</head>
<body>
    <header>
        <a href="#" class="logo">MangaBox</a>

        <nav class="navbar" id="navbar">
            <a href="Main.php">Home</a>
            <a href="Products.php">Products</a>
            <a href="#">About</a>
            <a href="#">Contact</a>
            <a href="bag.php"><i class='bx bx-shopping-bag'></i></a>
            <a href="login.php"><i class='bx bx-user'></i></a>
        </nav>
        
        <i class='bx bx-menu' id="nav-btn"></i>
    </header>

    <center>
    <div class="container">
        <h1>New Mangas</h1>
        <div class="new-book">
            <i class='bx bx-left-arrow-alt' id="back"></i>
            <div class="gallery">
                <div>
                    <?php
                        if($result->num_rows > 0) { ?>
                            <?php while ($row = $result->fetch_assoc()){?>
                                <a href="produkt.php?product_id=<?php echo $row['product_id'];?>"><img src="data:image/jpg;charset=utf8;base64, <?php echo base64_encode($row['product_img']);?>" alt="obraz.jpg"></a>
                            <?php } ?>
                    <?php } ?>
                </div>
            </div>
            <i class='bx bx-right-arrow-alt' id="next"></i>
        </div>
        <br>
        <h1>New Films</h1>
        <div class="new-films">
            
        </div>

    </div>
    </center>

    <script src="script/script.js"></script>
</body>
</html>

@import url("https://fonts.googleapis.com/css2?family=Tilt+Neon&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Tilt Neon", cursive;
  scroll-behavior: smooth;
  text-decoration: none;
  border: none;
  outline: none;
}

html{
  overflow-x: hidden;
  font-size: 62.5%;
}

body {
  background-image: url("backgroundImg2.jpg");
  background-size: cover;
  background-attachment:fixed;
}

header{
  display: flex;
  padding: 2rem 9%;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  justify-content: space-between;
  z-index: 100;
  align-items: center;
  background-color: white;
  box-shadow: 0px 20px 10px rgba(0, 0, 0, 0.45);
}

header .logo{
  font-size: 40px;
  font-weight: bold;
  color: black;
}

.navbar a, .bx-menu{
  font-size: 1.7rem;
  margin-left: 30px;
  color: black;
}

.navbar a i, .navbar i{
  font-size: 2.5rem;
}

.navbar a:hover, .navbar i:hover{
  animation: color 2s infinite;
}

header .bx-menu{
  font-size: 2rem;
  color: black;
  font-weight: bold;
  line-height: 80px;
  cursor: pointer;
  display: none;
}

.container {
  width: 75%;
  margin: auto;
  background-color: rgba(255, 255, 255, 0.70);
  box-shadow: 2px 2px 20px;
  border: 10px solid black;
  border-radius: 20px;
  margin-top: 120px;
  padding: 40px;
  height: auto;
}

.gallery{
  box-shadow: inset 1px 1px 30px 9px rgba(0, 0, 0, 1);
  background-color: gray;
  border: 1px solid black;
  padding: 3em;
  display: flex;
  overflow-x: scroll;
}

.gallery::-webkit-scrollbar{
  display: none;
}

.gallery div{
  width: 13cm;
  display: grid;
  grid-template-columns: auto auto auto;
  grid-gap: 20px;
  padding: 10px;
  flex: none;
}

.gallery div img{
  width: 100%;
  transition: transform 0.5s ease, box-shadow 0.5s ease;
  cursor: pointer;
}

.gallery div img:hover{
  transform: scale(1.1);
  box-shadow: 10px 10px 0px black;
}

.new-book{
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto auto;
}

.new-book i{
  font-size: 4rem;
  transition: color 1s ease;
  cursor: pointer;
}

.new-book i:hover{
  color: red;
}

.search-container{
  display: flex;
  font-size: 30px;
  position: relative;
  justify-content: center;
  align-items: center;
  width: 40%;
} 

.search-container .searchText{
  background-color: blueviolet;
  width: 100%;
  border-radius: 5rem;
  padding: 1rem;
  padding-left: 2rem;
  border: none;
  outline: none;
  transition: all 0.5s linear;
}

.searchText:focus{
  outline: none;
}

.search-container .searchBtn{
  width: 5rem;
  height: 5rem;
  background-color: transparent;
  font-size: 2.5rem;
  position: absolute;
  right: 0rem;
  display: grid;
  place-items: center;
  color: white;
}

.search-container .searchBtn:hover{
  animation: color 2s infinite;
  cursor: pointer;
}

.searchText::placeholder{
  color: white;
}

@keyframes color {
  0% {
    color: red;
  }
  25%{
    color: orange;
  }
  50%{
    color: yellow;
  }
  75%{
    color: orange;
  }
  100%{
    color: red;
  }
}

@media (max-width: 1100px) {
  header .logo{
    font-size: 30px;
    font-weight: bold;
    color: black;
  }

  header .bx-menu{
    display: block;
    font-size: 40px;
  }
  
  .navbar{
    position: fixed;
    width: 100%;
    height: 100%;
    left: -100%;
    top: 13.5%;
    text-align: center;
    background-color: rgb(97, 96, 96);
    transition: all .5s;
  }

  .active{
    position: fixed;
    left: 0%;
    top: 13.5%;
  }

  .navbar a{
    margin-top: 20px;
    display: block;
    font-size: 30px;
  }

  .navbar a i{
    font-size: 50px;
  }

  .container{
    margin-top: 150px;
  }
}

jest to strona główna razem z stylami a mój problem jest następujący. W divie galeria wyświetlam z bazy danych obrazy i po kliknięciu przenosi mnie pod adres produkt.php?product_id=1 (przykład) jak mogę pobrać to "produkt_id=1" aby wyświetlić dane tego produktu na drugim formularzu php. Oto strona na której chcę wyświetlić dane o tym id:

<?php
    session_start();
    @include 'includes/connect.php';
    
    $sqlImg = "SELECT product_id, product_img FROM produkty";
    $result = $connect->query($sqlImg);


?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>MangaBox</title>
    <link rel="stylesheet" href="css/style.css">
    <link rel="stylesheet" href="css/produkt.css">
    <link rel="icon" type="image/x-icon" href="images/icon.png">
    <link href='https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css' rel='stylesheet'>
</head>
<body>
    <header>
        <a href="#" class="logo">MangaBox</a>
        <nav class="navbar" id="navbar">
            <a href="Main.php">Home</a>
            <a href="Products.php">Products</a>
            <a href="#">About</a>
            <a href="#">Contact</a>
            <a href="bag.php"><i class='bx bx-shopping-bag'></i></a>
            <a href="login.php"><i class='bx bx-user'></i></a>
        </nav>
        <i class='bx bx-menu' id="nav-btn"></i>
    </header>

    
    <div class="container-product">
        <div class="product-view">
            <div class="img">
                <?php
                    if($result->num_rows > 0) { ?>
                        <?php while ($row = $result->fetch_assoc()){?>
                            <img src="data:image/jpg;charset=utf8;base64,<?php echo base64_encode($row['product_img']);?>" alt="">
                        <?php } ?>
                <?php } ?>
            </div>
            <div class="product_descript">
                <p class="tytul"><?php ?></p>
                <p class="opis"></p>
            </div>
        </div>
    </div>
 

    <script src="script/script.js"></script>
</body>
</html>

z góry dziękuję za odpowiedź

Jeżeli wartość ma być pobrana z linku w tym przypadku

produkt.php?product_id=1

użyj $_GET - $_GET['product_id']

P.S. Może zamiast tego zapisu

            <div class="img">
                <?php
                    if($result->num_rows > 0) { ?>
                        <?php while ($row = $result->fetch_assoc()){?>
                            <img src="data:image/jpg;charset=utf8;base64,<?php echo base64_encode($row['product_img']);?>" alt="">
                        <?php } ?>
                <?php } ?>
            </div>

zapisz np. tak

<?php
  session_start();
  $image = null;
    
  if (! empty($_GET['product_id']) && is_numeric($_GET['product_id'])) {
    @include 'includes/connect.php';
    
    $id = $_GET['product_id'];
 
    $sqlImg = "SELECT product_img FROM produkty WHERE product_id=$id";
    $result = $connect->query($sqlImg);
    if ($result->num_rows > 0) { 
      $row = $result->fetch_assoc();
      $image = '<img src="data:image/jpg;charset=utf8;base64,' . base64_encode($row['product_img']) . '" alt="">';
    } else
      $image = '<span class="error">Brak danych</span>';
  }   
?>
    
<!DOCTYPE html>
<html lang="en">
<head>
  ...
    
  <div class="product-view">
    <div class="img">
      <?php echo $image; ?>
    </div>
  </div>

  ...
</html>