中古リサイクルサイトはPHPで開発されたお気に入り機能を利用しています。

<?php
// 获取当前用户ID和商品ID
$userID = $_SESSION['userID'];
$itemID = $_GET['itemID'];

// 根据用户ID和商品ID检查是否已经收藏过
$query = "SELECT * FROM favorites WHERE userID = $userID AND itemID = $itemID";
$result = mysqli_query($conn, $query);
if (mysqli_num_rows($result) > 0) {
    echo "该商品已经在收藏夹中";
} else {
    // 插入新的收藏记录
    $query = "INSERT INTO favorites (userID, itemID, dateAdded) VALUES ($userID, $itemID, NOW())";
    mysqli_query($conn, $query);
    echo "已成功添加至收藏夹";
}
?>

<?php
// 获取当前用户ID
$userID = $_SESSION['userID'];

// 获取用户收藏夹中的商品ID列表
$query = "SELECT itemID FROM favorites WHERE userID = $userID";
$result = mysqli_query($conn, $query);

// 遍历商品ID列表，查询并显示相应的商品信息
while ($row = mysqli_fetch_assoc($result)) {
    $itemID = $row['itemID'];
    
    // 查询商品信息
    $query = "SELECT * FROM items WHERE itemID = $itemID";
    $itemResult = mysqli_query($conn, $query);
    $item = mysqli_fetch_assoc($itemResult);
    
    // 显示商品信息
    echo "商品名称：" . $item['itemName'] . "<br>";
    echo "商品价格：" . $item['itemPrice'] . "<br><br>";
}
?>

<?php
// 获取当前用户ID和要取消收藏的商品ID
$userID = $_SESSION['userID'];
$itemID = $_GET['itemID'];

// 删除收藏记录
$query = "DELETE FROM favorites WHERE userID = $userID AND itemID = $itemID";
mysqli_query($conn, $query);
echo "已成功取消收藏";
?>