如何使用Elasticsearch和PHP构建智能推荐引擎

<?php
$movies = [
    [
        'id' => '1',
        'title' => 'The Shawshank Redemption',
        'genre' => ['crime', 'drama']
    ],
    [
        'id' => '2',
        'title' => 'The Godfather',
        'genre' => ['crime', 'drama']
    ],
    // 更多电影数据...
];

foreach ($movies as $movie) {
    $params = [
        'index' => 'recommendations',
        'id' => $movie['id'],
        'body' => $movie
    ];
    
    // 将电影数据插入到Elasticsearch
    $response = $client->index($params);
}

<?php
function getRecommendations($movieId) {
    $params = [
        'index' => 'recommendations',
        'body' => [
            'query' => [
                'more_like_this' => [
                    'fields' => ['genre'],
                    'like' => [
                        [
                            '_index' => 'recommendations',
                            '_id' => $movieId
                        ]
                    ]
                ]
            ]
        ]
    ];

    // 使用Elasticsearch进行相似性搜索
    $response = $client->search($params);

    return $response['hits']['hits'];
}

<?php
$movieId = $_GET['id'];

$recommendations = getRecommendations($movieId);

foreach ($recommendations as $recommendation) {
    $title = $recommendation['_source']['title'];

    echo "<li>$title</li>";
}