PHP 中基于 Elasticsearch 的推荐系统设计与实现

// 导入用户数据
$users = [
    [
        'id' => 1,
        'name' => 'user1',
        'age' => 20,
    ],
    [
        'id' => 2,
        'name' => 'user2',
        'age' => 25,
    ],
];

foreach ($users as $user) {
    $params = [
        'index' => 'users',
        'id' => $user['id'],
        'body' => $user,
    ];
    
    $response = $client->index($params);
}

// 导入商品数据
$products = [
    [
        'id' => 1,
        'name' => 'product1',
        'price' => 100,
    ],
    [
        'id' => 2,
        'name' => 'product2',
        'price' => 200,
    ],
];

foreach ($products as $product) {
    $params = [
        'index' => 'products',
        'id' => $product['id'],
        'body' => $product,
    ];
    
    $response = $client->index($params);
}

// 构建用户索引
$params = [
    'index' => 'users',
    'body' => [
        'mappings' => [
            'properties' => [
                'name' => [
                    'type' => 'text',
                ],
                'age' => [
                    'type' => 'integer',
                ],
            ],
        ],
    ],
];

$response = $client->indices()->create($params);

// 构建商品索引
$params = [
    'index' => 'products',
    'body' => [
        'mappings' => [
            'properties' => [
                'name' => [
                    'type' => 'text',
                ],
                'price' => [
                    'type' => 'integer',
                ],
            ],
        ],
    ],
];

$response = $client->indices()->create($params);

// 计算用户和商品之间的关联关系
$actions = [
    [
        'index' => [
            '_index' => 'interactions',
            '_id' => 1,
        ],
    ],
    [
        'user_id' => 1,
        'product_id' => 1,
        'timestamp' => '2021-01-01 00:00:00',
    ],
    [
        'index' => [
            '_index' => 'interactions',
            '_id' => 2,
        ],
    ],
    [
        'user_id' => 1,
        'product_id' => 2,
        'timestamp' => '2021-02-01 00:00:00',
    ],
    // ...
];

$params = [
    'refresh' => true,
    'body' => $actions,
];

$response = $client->bulk($params);

// 对用户进行推荐
$params = [
    'index' => 'interactions',
    'body' => [
        'query' => [
            'match' => [
                'user_id' => 1,
            ],
        ],
        'size' => 10,
    ],
];

$response = $client->search($params);