How to use PHP to implement full-text search and keyword extraction functions

How to use PHP to implement full-text search and keyword extraction functions

Full-text search and keyword extraction are common functions in modern websites and applications that can provide users with Better search experience and relevant recommendations. In PHP, we can use full-text indexing and keyword extraction technology to achieve these functions. This article will introduce how to use PHP to implement full-text search and keyword extraction functions, and provide corresponding code examples.

1. Implementation of full-text search function

Full-text search refers to searching for records containing specified keywords in text content. In PHP, we can use the full-text indexing function of the database or the search engine library to implement the full-text search function.

1.1 Use database full-text index

Databases such as MySQL and PostgreSQL provide full-text indexing functions, which can create full-text indexes in database tables to speed up searches. The following is an example of using MySQL full-text index:

// 建立全文索引
CREATE FULLTEXT INDEX index_name ON table_name(column_name);

// 执行全文搜索
SELECT * FROM table_name WHERE MATCH(column_name) AGAINST('keyword');

1.2 Using the search engine library

In addition to the full-text indexing function of the database, we can also use the open source search engine library to implement the full-text search function. Such as Elasticsearch, Apache Solr, etc. The following is an example of using Elasticsearch to implement full-text search:

require 'vendor/autoload.php';

use ElasticsearchClientBuilder;

// 连接 Elasticsearch
$hosts = ['localhost:9200'];
$client = ClientBuilder::create()
            ->setHosts($hosts)
            ->build();

// 创建索引
$params = [
    'index' => 'my_index',
    'body'  => [
        'settings' => [
            'number_of_shards' => 1,
            'number_of_replicas' => 0
        ]
    ]
];
$response = $client->indices()->create($params);

// 创建文档
$params = [
    'index' => 'my_index',
    'id' => '1',
    'body' => [
        'title' => 'Example Document',
        'content' => 'This is an example document for full text search.'
    ]
];
$response = $client->index($params);

// 执行全文搜索
$params = [
    'index' => 'my_index',
    'body' => [
        'query' => [
            'match' => [
                'content' => 'search keyword'
            ]
        ]
    ]
];
$response = $client->search($params);

2. Implementation of keyword extraction function

Keyword extraction refers to extracting representative keywords from text Keywords are often used to generate tags, search suggestions and other functions. In PHP, we can use open source keyword extraction libraries to implement keyword extraction functions, such as Textrank, TF-IDF, etc. The following is an example of using Textrank to implement keyword extraction:

require 'vendor/autoload.php';

use JekkayTextRankTextRankFacade;

// 使用 Textrank 提取关键字
$tr = new TextRankFacade();
$keywords = $tr->extract('This is an example document for keyword extraction.');

print_r($keywords);

The above is a simple example of using PHP to implement full-text search and keyword extraction functions. In practical applications, we can also combine other technologies such as word segmentation, semantic analysis, etc. to improve the accuracy and effect of search and extraction. Hope this article helps you!

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