Implement Real-Time Search and Automatic Index Updating with PHP and Xunsearch

When developing a website or application, search functionality is essential, and traditional database searches often lack the efficiency required for real-time results. Xunsearch, a C++‑based full‑text search engine supporting Chinese segmentation, can be used with PHP to provide fast, real‑time search and automatic index updates.

1. Environment Preparation

Before starting, ensure you have a PHP environment (version 5.4 or higher) and a Xunsearch server downloaded from the official site.

2. Install Xunsearch

Unzip the downloaded Xunsearch server package and run ./xunsearchd inside the server directory to start the Xunsearch daemon.

3. Index and Search Example

Create a PHP file named search.php and include the Xunsearch library: require_once '/path/to/sdk/php/lib/XS.php'; Instantiate the Xunsearch object and specify the index configuration: $xs = new XS('/path/to/xunsearch/app.ini'); Set up the search object, enable fuzzy search, limit results, configure segmentation, and assign field weights:

$search = $xs->search;
$search->setFuzzy();
$search->setLimit(10);
$search->setScwsMulti(3);
$search->addWeight('title', 10);
$search->addWeight('content', 5);

Perform the search using a keyword from the query string and iterate over the results:

$keyword = $_GET['q'];
$result = $search->search($keyword);
foreach ($result as $item) {
    echo $item->title . '<br>';
    echo $item->content . '<br><br>';
}

4. Automatic Index Updating

Create a PHP file named update.php, include the Xunsearch library, and instantiate the Xunsearch object:

require_once '/path/to/sdk/php/lib/XS.php';
$xs = new XS('/path/to/xunsearch/app.ini');

Obtain the index object and fetch data that needs to be indexed (example uses a MySQL database):

$pdo = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $pdo->prepare('SELECT * FROM articles');
$stmt->execute();
$data = $stmt->fetchAll(PDO::FETCH_ASSOC);

Loop through the data, create an XSDocument for each record, and update the index:

foreach ($data as $item) {
    $doc = new XSDocument();
    $doc->setFields($item);
    $index->update($doc);
}
$index->flushIndex();

Conclusion

The guide shows how to leverage PHP and Xunsearch to add efficient real‑time search to a website or application and how to keep the search index up‑to‑date automatically, ensuring that users always receive the latest results.