智能推荐系统php mysql

<?php
// 连接数据库
$conn = new mysqli("localhost", "username", "password", "database");

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 获取用户历史行为数据
$user_id = 1;
$sql = "SELECT item_id, rating FROM user_history WHERE user_id = $user_id";
$result = $conn->query($sql);

$history_items = [];
while ($row = $result->fetch_assoc()) {
    $history_items[] = $row['item_id'];
}

// 计算推荐结果（简单示例：推荐评分高的相似物品）
$recommended_items = [];
foreach ($history_items as $item_id) {
    $sql = "SELECT similar_item_id, similarity FROM item_similarity WHERE item_id = $item_id ORDER BY similarity DESC LIMIT 5";
    $result = $conn->query($sql);

    while ($row = $result->fetch_assoc()) {
        if (!in_array($row['similar_item_id'], $history_items)) { // 避免重复推荐
            $recommended_items[$row['similar_item_id']] += $row['similarity'];
        }
    }
}

// 按推荐度排序并输出前5个推荐结果
arsort($recommended_items);
$top_recommended_items = array_slice(array_keys($recommended_items), 0, 5);

echo "推荐结果：";
foreach ($top_recommended_items as $item_id) {
    echo $item_id . " ";
}

$conn->close();
?>