PHP implements the question filtering and sensitive word blocking functions in the knowledge question and answer website.

PHP implements question filtering and sensitive word blocking functions in knowledge Q&A websites

In the development of modern social networks and knowledge Q&A websites, question filtering and sensitive word blocking functions have become an issue that cannot be ignored. In order to maintain a good Internet environment and protect users' sense of security, we need to implement an effective question filtering and sensitive word blocking function in the website.

PHP is a widely used programming language with powerful data processing and string manipulation capabilities. We can use these characteristics of PHP to write a piece of code to implement question filtering and sensitive word blocking functions.

First, we need a list to store sensitive words. This list can be an array or a text file, and the content contains sensitive words that need to be blocked.

$sensitiveWords = array('敏感词1', '敏感词2', '敏感词3');

Next, we create a function to filter and mask sensitive words in the question. The basic idea of ​​the function is to traverse each word in the question and check whether it is a sensitive word. If it is a sensitive word, replace it with an asterisk to achieve the blocking effect.

function filterSensitiveWords($question, $sensitiveWords) {
    foreach ($sensitiveWords as $word) {
        $question = str_ireplace($word, '****', $question);
    }
    return $question;
}

Now, we can test the effect of this function:

$question = '这个问题中包含了敏感词1和敏感词2，请注意过滤。';
$filteredQuestion = filterSensitiveWords($question, $sensitiveWords);
echo $filteredQuestion;

The output result is: This question contains and , please pay attention to filtering.

Through this simple example, we can see that sensitive words are successfully blocked.

In addition to sensitive word blocking, we can also implement problem filtering. Question filtering can determine whether the requirements are met by checking the keywords in the question. For example, we can limit questions to include abusive language.

function filterQuestion($question) {
    $allowedWords = array('问题', '知识', '答案');
    $words = explode(' ', $question);
    foreach ($words as $word) {
        if (!in_array($word, $allowedWords)) {
            return false;
        }
    }
    return true;
}

We can also combine these two functions and use them in Q&A websites. For example, when a user posts a new question, we can first check whether the question is compliant through the question filtering function, and then use the sensitive word blocking function to process sensitive words.

$newQuestion = '这是一个不合规的问题，包含了敏感词1，请注意处理。';
if (filterQuestion($newQuestion)) {
    $filteredQuestion = filterSensitiveWords($newQuestion, $sensitiveWords);
    // 将问题保存到数据库或者其他操作
    echo '问题已发布！';
} else {
    echo '问题内容不符合要求，请重新编辑。';
}

Through the above code example, we have implemented a simple question filtering and sensitive word blocking function. Of course, this is just a basic framework. In fact, the question filtering and sensitive word blocking functions can be more complex and perfect. We can add more sensitive words, optimize the filtering algorithm, or add other filtering rules according to actual needs.

To sum up, PHP can easily implement question filtering and sensitive word blocking functions in knowledge Q&A websites. Through reasonable design and development, we can provide users with a more friendly and healthy Internet environment.

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