Blocking sensitive words and content security review in PHP real-time chat system

Blocking of sensitive words and content security review in PHP real-time chat system

In today's Internet era, real-time chat system has become one of the main ways for people to communicate. However, with the diversification of chat content and the increase in the number of users, how to ensure the security of chat information and the accuracy of the content has become an important issue. This article will introduce how to implement masking of sensitive words and content security review in the PHP real-time chat system, and attach corresponding code examples.

1. Sensitive word filtering

Sensitive word filtering refers to blocking or replacing sensitive words contained in chat content. Sensitive words may include indecent, insulting, discriminatory and other content, which may have a negative impact on users. The following is an implementation example of a simple sensitive word filtering function:

function filterSensitiveWords($content, $sensitiveWords) {
    $filteredContent = $content;
    
    foreach($sensitiveWords as $word) {
        $replaceString = str_repeat("*", mb_strlen($word, 'UTF-8'));
        $filteredContent = str_ireplace($word, $replaceString, $filteredContent);
    }
    
    return $filteredContent;
}

$content = "这是一条不雅的聊天内容";
$sensitiveWords = ["不雅", "歧视", "侮辱"];
$filteredContent = filterSensitiveWords($content, $sensitiveWords);

echo $filteredContent;

Run the above code, and the output result is: This is a chat content of *.

Through the above code, we can see that the sensitive word filtering function first traverses the sensitive word array, and then uses the str_ireplace function to replace the sensitive word with an asterisk of the same length. This can effectively block sensitive words, protect user privacy and improve user experience.

2. Content Security Review

Sensitive word filtering only ensures the blocking of sensitive words in chat content. For other types of illegal content, we need to conduct content security review. Content security auditing can be implemented through machine learning, regular expressions, or keyword filtering. The following is an example of content security audit using keyword filtering:

function contentSafeAudit($content, $forbiddenKeywords) {
    $isSafe = true;
    
    foreach($forbiddenKeywords as $keyword) {
        if(strpos($content, $keyword) !== false) {
            $isSafe = false;
            break;
        }
    }

    return $isSafe;
}

$content = "这是一段违规的文本内容";
$forbiddenKeywords = ["违规", "禁止", "非法"];
$isSafe = contentSafeAudit($content, $forbiddenKeywords);

if($isSafe) {
    echo "内容安全通过审核";
} else {
    echo "内容存在违规";
}

When you run the above code, the output result is: There are violations in the content.

In the above code, the content security audit function first traverses the array of prohibited keywords, and then uses the strpos function to determine whether the chat content contains the keywords. If it is included, it is judged as unsafe, otherwise it is deemed to have passed the review. This can effectively avoid illegal content in the chat system.

To sum up, through sensitive word filtering and content security review measures, sensitive words and illegal content can be blocked and reviewed in the PHP real-time chat system. Of course, implementing a complete chat system also requires consideration of other security issues, such as user authentication and data encryption. I hope this article can provide you with some reference and help in the development of real-time chat system.

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