Use PHP to develop question moderation and sensitive information filtering functions in the knowledge Q&A website.

Use PHP to develop question moderation and sensitive information filtering functions in the knowledge Q&A website

In the knowledge Q&A website, users can post questions and answer questions from other users. In order to ensure the content quality and user experience of the website, we need to review posted questions and filter sensitive information.

This article will introduce how to use PHP to develop simple issue auditing and sensitive information filtering functions. I will use a class called "QAFilter" to implement these functions.

Question review function

The question review function is mainly used to review questions posted by users to determine whether they are compliant. We can judge the compliance of the question based on some rules, such as whether it contains sensitive words, whether it conforms to the theme of the website, etc.

The following is a simple question review example:

class QAFilter {
    private $sensitiveWords = array("敏感词1", "敏感词2", "敏感词3");
    
    public function filterQuestion($question) {
        // 进行问题审核，判断是否含有敏感词
        foreach ($this->sensitiveWords as $word) {
            if (strpos($question, $word) !== false) {
                return false;
            }
        }
        
        // 其他规则判断...
        
        return true;
    }
}

In the above example, we put the sensitive words into an array and filter them one by one in the filterQuestion method Check whether the question contains these sensitive words. If it is found that the question contains sensitive words, false is returned, indicating that the question is not compliant; otherwise, true is returned, indicating that the question is compliant.

Sensitive information filtering function

The sensitive information filtering function is to protect the privacy of users and prevent the emergence of bad information. We can define some rules to filter sensitive information, such as phone numbers, email addresses, etc.

The following is a simple example of filtering sensitive information:

class QAFilter {
    private $sensitiveWords = array("敏感词1", "敏感词2", "敏感词3");
    
    public function filterQuestion($question) {
        // ...
    }
    
    public function filterSensitiveInfo($text) {
        // 进行敏感信息过滤，例如手机号码、邮箱地址等
        $text = preg_replace("/(1[3456789]d{9})/", "[手机号码]", $text);
        $text = preg_replace("/([a-zA-Z0-9_]+@[a-zA-Z0-9]+.[a-zA-Z0-9]+)/", "[邮箱地址]", $text);
        
        // 其他规则判断...
        
        return $text;
    }
}

In the above example, we use regular expressions to match mobile phone numbers and email addresses, and use [Mobile phone number] and [email address]replace the original sensitive information. In this way, users' privacy can be protected and harmful information can be filtered.

Usage Example

Here is a sample code that uses the above knowledge auditing and sensitive information filtering:

$question = "这是一个包含敏感词的问题";
$filteredQuestion = $qafilter->filterSensitiveInfo($question);

if ($qafilter->filterQuestion($filteredQuestion)) {
    // 问题审核通过，可以发布到网站上
    echo "问题发布成功！";
} else {
    // 问题包含敏感词或其他违规情况，不能发布
    echo "问题包含敏感词或其他违规情况，无法发布！";
}

In the above example, we first pass filterSensitiveInfo# The ## method filters the sensitive information in the question, and then uses the filterQuestion method to review the question. If the question passes review, it can be posted to the website; otherwise, it cannot be posted.

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