Build an efficient news search engine using PHP and Xunsearch

Use PHP and Xunsearch to build an efficient news search engine

Introduction:
With the rapid development of the Internet, massive information has poured into our lives. In this era of information explosion, search engines have become an important tool for us to obtain useful information. Among them, news search engines are particularly important to users. This article will introduce how to use PHP and Xunsearch to build an efficient news search engine to help users quickly and accurately obtain the information they need.

1. Introduction to Xunsearch
Xunsearch is an open source full-text search engine that supports multiple languages ​​and platforms and has high performance and high reliability. It is developed based on the famous C/C full-text search engine Xapian and is a powerful and flexible search engine solution.

2. Introducing Xunsearch
First, we need to download and install the Xunsearch server from the Xunsearch official website. The installation process is relatively simple and can be completed according to the official guide.
After the installation is complete, introduce Xunsearch related library files into the PHP project.

require '/path/to/xunsearch/sdk/php/lib/XS.php';
?>

3. Create Xunsearch index
Before using Xunsearch to search, we need to first create an index for the data to be searched. Taking news search as an example, we can treat each news article as a document and then add these documents to the Xunsearch index.

$xs = new XS('news'); // Create a Xunsearch project named news
$index = $xs->index; // Get Index example

$news = [

['id' => 1, 'title' => '新冠病毒疫情', 'content' => '新冠病毒疫情持续蔓延'],
['id' => 2, 'title' => '中国科技发展', 'content' => '中国科技实力不断提升'],
// 其他新闻...

];

foreach ($news as $n) {

$doc = new XSDocument();
$doc->setFields($n);
$index->add($doc);

}

$index->flushIndex(); // Wait for the index refresh to be completed
?>

4. Search
After the index creation is completed, we can use Xunsearch for news search. After the user enters the keywords, the system will search for matching news in the index based on the keywords and return the results to the user.

$xs = new XS('news'); // Create a Xunsearch project named news
$search = $xs->search; // Get Search example

$keyword = $_GET['keyword']; // The keyword entered by the user
$search->setQuery($keyword); //Set the search keyword

// Paginate search results
$page = $_GET['page'] ?? 1; // Current page number, default is 1
$pageSize = 10; // Results displayed on each page Number
$search->setLimit(($page - 1) * $pageSize, $pageSize);

$search->setSort('id'); // Set sorting rules
$search->setCollapse('id'); // Remove duplicates
$search->setQuery('status:1'); // Filter conditions

$result = $search- >search(); // Perform search

$total = $search->getLastCount(); // Total number of search results
$docs = $result->getDocuments(); // Get matching documents

foreach ($docs as $doc) {

echo '标题：' . $doc->title . '<br>';
echo '内容：' . $doc->content . '<br>';
echo '<hr>';

}
?>

5. Performance Optimization
In order to improve search engines For performance, we can optimize Xunsearch.

1. Use multiple indexes: Create different indexes for different types of data, which can improve search efficiency.
2. Regular index optimization: Regularly using the optimize() function to optimize the index can speed up the search.
3. Add search fields: Adding more search fields to the document can improve the accuracy of the search.
4. Asynchronous refresh index: Using the asynchronous mode of flushIndex($sync = false) function can reduce the delay of search requests.

Conclusion:
Through the combination of PHP and Xunsearch, we can quickly build an efficient news search engine. I hope this article helps you when developing a search engine. Through reasonable optimization configuration and flexible calling, we can create a more efficient and practical search engine according to specific needs.

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