如何同时从不同表中的数据库中获取数据 PHP MYSQL

Question

I have 2 tables that are related to one another. The first table is a product table which includes (Product_id,product_title and product_price) and the other one is images table which includes (image_id, image_product_title(FK) and image_name). So here I am trying to fetch all products with its images so it will have a product and then inside that product multiple images of a product but I am having trouble calling 2 different queries in a nested way. Here is my code so you can understand what I am trying to do...

    $stmt = mysqli_prepare($connection,"SELECT product_id,product_title,product_price FROM products");
    mysqli_stmt_execute($stmt);
    mysqli_stmt_bind_result($stmt,$product_id,$product_title,$product_price);
        while(mysqli_stmt_fetch($stmt)){
            
  //HTML PART
            $stmt2 = mysqli_prepare($connection,"SELECT image_id,image_product_title,image_name FROM images WHERE image_product_title = '$product_title'");
            mysqli_stmt_execute($stmt2);
            mysqli_stmt_bind_result($stmt2,$image_id,$image_product_title,$image_name);
                while(mysqli_stmt_fetch($stmt2)){
                echo $image_name;
                } 
  
    //HTML PART
  
            echo $product_id; 
            echo $product_title;
            echo $product_price;
  

//HTML PART
        } 

Is there any way to do something like this? The main idea is to loop all products and inside that loop second loop will loop actual products images but product is not at the same table with images so I am struggling to take datas from both tables in the nested way

Answer 1

Don't mix PHP and HTML. First prepare the data in PHP and then only display it in HTML.

Generally, this kind of thing would be much simpler to do with PDO. If it's not too late consider switching to PDO.

To solve the problem you have to use buffered results or fetch everything into an array/object before executing the next statement. If you must use mysqli then something like this should do the job:

// preparation of a nested array structure with products and their images

$stmt = $connection->prepare('SELECT product_id,product_title,product_price FROM products');
$stmt->execute();
$products = [];
foreach ($stmt->get_result() as $row) {
    $products[$row['product_id']] = $row;
}

$stmt = $connection->prepare('SELECT image_id,image_product_title,image_name FROM images');
$stmt->execute();
foreach ($stmt->get_result() as $image) {
    $products[$image['product_id']][] = $image;
}

Then outputting this in HTML is a piece of cake:

<?php foreach($products as $product): ?>
    <?=htmlspecialchars($product['product_title']) ?>
    <?php foreach($products['images'] as $image): ?>
        <?=htmlspecialchars($image['image_name']) ?>
    <?php endforeach ?>
<?php endforeach ?>