利用PHP开发的二手回收网站支持热门标签筛选

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
}

// 获取所有标签
$sql = "SELECT tag_id, tag_name FROM tags";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "<form action='product_list.php' method='GET'>";
    while ($row = $result->fetch_assoc()) {
        $tag_id = $row['tag_id'];
        $tag_name = $row['tag_name'];
        echo "<input type='checkbox' name='tags[]' value='$tag_id'>$tag_name ";
    }
    echo "<button type='submit'>筛选</button>";
    echo "</form>";
}

// 处理筛选结果
if (isset($_GET['tags'])) {
    $selected_tags = $_GET['tags'];
    
    $sql = "SELECT p.* FROM products p
    INNER JOIN product_tags pt ON p.product_id = pt.product_id
    WHERE pt.tag_id IN (" . implode(",", $selected_tags) . ")";
    
    $result = $conn->query($sql);
    
    if ($result->num_rows > 0) {
        // 显示筛选结果
        while ($row = $result->fetch_assoc()) {
            echo $row['product_name'];
        }
    } else {
        echo "没有找到匹配的商品。";
    }
}

$conn->close();
?>