Create multilingual search functionality using PHP and Xunsearch

Use PHP and Xunsearch to create multilingual search functions

Overview:
With the development of globalization, more websites need to support multilingual search functions. In this article, we will explain how to use PHP and the Xunsearch library to create a multilingual search function.

Xunsearch is an open source full-text search engine that supports multi-language search and high-performance retrieval capabilities. It is written in C and is fast, scalable and easy to use. Through PHP extension, we can easily use Xunsearch in PHP projects to implement full-text search function.

Step 1: Install the Xunsearch library
First, we need to download and install the Xunsearch library. You can download the latest version from Xunsearch's official website. The installation process is very simple, just follow the instructions in the official documentation.

Step 2: Create an index
Before using Xunsearch, we need to create an index first. The index is the basis of search and contains the data to be retrieved. The following is a simple sample code for creating an index named "multilang" and setting various properties of the index.

<?php
require_once 'path/to/XS.php';

$xs = new XS('multilang_index'); // 索引名称
$index = $xs->index;

$index->setDefaultCharset('UTF-8');
$index->setScheme(new XSScheme()); // 默认的scheme

$index->addField('id'); // 添加ID字段
$index->addField('title', 'RANK_TITLE'); // 添加标题字段
$index->addField('content', 'BODY'); // 添加内容字段

$index->setMultiFields(array('title', 'content')); // 设定多字段搜索
$index->setDfType(XSFieldMeta::DF_TEXT); // 默认字段类型

$index->setDb('path/to/data.db'); // 数据库位置

$index->setTokenizer(new XSTokenizerScws()); // 分词器

$index->addSynonym('百度 搜索引擎'); // 同义词
$index->addSynonym('Google Google搜索'); // 同义词
$index->saveSynonym(); // 保存同义词表

In the above code, we define the fields through the addField method, and set multiple searchable fields through the setMultiFields method. At the same time, we also set the default character encoding and tokenizer.

Step 3: Add index data
After creating the index, we need to add the data to be searched to the index. Below is a simple example code.

<?php
require_once 'path/to/XS.php';

$xs = new XS('multilang_index'); // 索引名称
$index = $xs->index;

$doc = new XSDocument();
$doc->setFields(array(
    'id' => 1,
    'title' => 'Hello World',
    'content' => 'Hello World, Welcome to My Website!'
));
$index->add($doc);
$index->flushIndex();

In the above code, we create a new XSDocument object and set the fields and corresponding values ​​through the setFields method. We then add the document to the index using the add method and flush the index using the flushIndex method.

Step 4: Perform the search
Once the index data has been added, we can begin to perform the search operation. Below is a simple example code.

<?php
require_once 'path/to/XS.php';

$xs = new XS('multilang_index'); // 索引名称
$search = $xs->search;

$search->setCharset('UTF-8'); // 设置字符编码
$search->addWeight('title', 5); // 设置字段权重

// 执行搜索
$result = $search->search('Hello World');
if ($result) {
    foreach ($result as $doc) {
        echo $doc->title . ': ' . $doc->content . "
";
    }
}

In the above code, we set the character encoding through the setCharset method, and set the search weight of the field using the addWeight method. Then, we use the search method to perform a search, and if there are results, loop through the result set and output it.

Summary:
By using PHP and Xunsearch, we can easily create a multi-language search function. In this article, we introduced how to install the Xunsearch library, create an index, add index data, and perform search operations. I hope this article helps you in the process of creating multilingual search capabilities.

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