How to use PHP and Xunsearch to filter sensitive words and search results

How to use PHP and Xunsearch for sensitive word filtering and search result filtering

With the development and popularization of the Internet, protecting the security of user information and the comfort of user experience have become major website and application development important issues that investors need to face. Sensitive word filtering and search result filtering are one of the most critical tasks. Through the combination of PHP and Xunsearch, we can achieve efficient sensitive word filtering and search result filtering functions.

1. Sensitive word filtering

1. Installing Xunsearch
   Xunsearch is an open source full-text search engine based on PHP, supporting distributed and high-performance search.

First, we need to download and install Xunsearch. The latest version of Xunsearch can be downloaded from the official website (http://www.xunsearch.com/).

2. Build a sensitive word index
   After installing Xunsearch, we need to build a sensitive word index. In Xunsearch, you can use the addIndexPath method to add sensitive words to the index. The sample code is as follows:

require_once 'sdk/php/lib/XS.php';

$xs = new XS('sensitive'); // 设置索引名称
$index = $xs->index;
$doc = new XSDocument();
$doc->setFields(array(
    'word',
    'instances',
    'create_time'
));

// 从敏感词列表中逐个添加到索引中
$sensitiveWords = ['敏感词1', '敏感词2', '敏感词3'];
foreach ($sensitiveWords as $word) {
    $doc->setField('word', $word);
    $doc->setField('instances', 0);
    $doc->setField('create_time', time());
    $index->add($doc);
}

3. Filtering sensitive words
   When filtering sensitive words, we can use Xunsearch Search function provided. The sample code is as follows:

require_once 'sdk/php/lib/XS.php';

$xs = new XS('sensitive'); // 设置索引名称
$index = $xs->index;
$search = $xs->search;

$query = '我是一个敏感词';
$result = $search->setQuery($query)->search();

if ($result->count() > 0) {
    // 敏感词匹配成功，进行处理
    foreach ($result as $doc) {
        // 替换敏感词为*
        $word = $doc->word;
        $replace = str_repeat('*', mb_strlen($word));
        $query = str_replace($word, $replace, $query);
    }
}

echo $query; // 输出我是一个***

Through the above code, we can filter sensitive words and replace sensitive words with * or other special characters to ensure the security of user information.

2. Search result filtering
In some specific scenarios, we sometimes need to filter the search results to exclude some content that does not meet the requirements, such as low-quality content or illegal content.

1. Build search result index
   In Xunsearch, we can add additional data to the search results through the addExData method. The sample code is as follows:

require_once 'sdk/php/lib/XS.php';

$xs = new XS('search'); // 设置索引名称
$index = $xs->index;
$doc = new XSDocument();
$doc->setFields(array(
    'url',
    'title',
    'content',
    'quality'
));

// 模拟搜索结果添加到索引中
$searchResults = [
    ['url' => 'url1', 'title' => '标题1', 'content' => '内容1', 'quality' => 1],
    ['url' => 'url2', 'title' => '标题2', 'content' => '内容2', 'quality' => 0],
    ['url' => 'url3', 'title' => '标题3', 'content' => '内容3', 'quality' => 1],
];
foreach ($searchResults as $result) {
    $doc->setFields($result);
    $doc->addExData('quality', $result['quality']); // 添加额外数据
    $index->add($doc);
}

2. Filter search results
   After obtaining the search results, we can filter by reading additional data. The sample code is as follows:

require_once 'sdk/php/lib/XS.php';

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

$query = '关键词';
$result = $search->setQuery($query)->search();

if ($result->count() > 0) {
    foreach ($result as $doc) {
        $quality = $doc->getExData('quality');
        if ($quality == 0) {
            // 不符合要求的搜索结果，进行处理
            $result->remove($doc);
        }
    }
}

// 输出过滤后的搜索结果
foreach ($result as $doc) {
    echo $doc->url . "<br>";
    echo $doc->title . "<br>";
    echo $doc->content . "<br>";
    // ...
}

Through the above code, we can filter the search results, exclude some content that does not meet the requirements, and improve the quality of the search results and user experience.

Summary:
The combination of PHP and Xunsearch can achieve efficient sensitive word filtering and search result filtering functions. By building sensitive word indexes and search result indexes, we can quickly locate and filter sensitive words and content that does not meet requirements, ensuring the security of user information and the quality of search results. When applied in actual projects, it can be optimized and expanded according to specific situations to meet the requirements of different needs.

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