Using PHP to implement message filtering and sensitive word processing for real-time chat function

Use PHP to implement message filtering and sensitive word processing of real-time chat function

With the development of modern social networks and online chat applications, real-time chat function has become a common Functional Requirements. When developing such functions, it is inevitable to consider whether the content of the user's speech is legal and whether it contains sensitive words. This article will introduce how to use PHP to implement message filtering and sensitive word processing for real-time chat functions to ensure user experience and platform security.

1. The basic principle of message filtering
The basic principle of message filtering is to detect and process the text input by the user, filter out messages containing sensitive words, or replace sensitive words with specific identifiers symbol. The core content of message filtering lies in the matching and processing of sensitive words.

2. Implementation method of sensitive word processing

1. Use sensitive vocabulary library
   The sensitive vocabulary library is a text file containing a large number of known sensitive words, which can be customized according to your needs Build or get it from the internet. In the PHP code, we can read the contents of the sensitive vocabulary into memory and convert it into an array for matching.
2. Matching sensitive words
   In PHP, you can use regular expressions or string functions to match sensitive words. If you use regular expressions, you can use the preg_match function, such as:

$pattern = "/敏感词1|敏感词2|敏感词3/i";
if (preg_match($pattern, $message)) {
    echo "消息包含敏感词，不允许发送！";
}

If you use string functions, you can use the strpos function, such as:

$keywords = array("敏感词1", "敏感词2", "敏感词3");
foreach ($keywords as $keyword) {
    if (strpos($message, $keyword) !== false) {
        echo "消息包含敏感词，不允许发送！";
        break;
    }
}

3. Replace sensitive words
   In some cases, we not only need to filter sensitive words, but also need to replace sensitive words with specific identifiers, such as *. You can use PHP's str_replace function to implement the replacement operation, such as:

$keywords = array("敏感词1", "敏感词2", "敏感词3");
$message = str_replace($keywords, "***", $message);

3. Comprehensive example
The following is a comprehensive example that shows how to use PHP to implement message filtering and sensitivity of the real-time chat function Word processing:

<?php
function filterMessage($message) {
    // 读取敏感词库
    $keywords = file("sensitive_words.txt", FILE_IGNORE_NEW_LINES);
    
    // 进行敏感词匹配
    foreach ($keywords as $keyword) {
        if (strstr($message, $keyword) !== false) {
            return false;
        }
    }

    // 替换敏感词
    $message = str_replace($keywords, "***", $message);

    return $message;
}

// 示例
$message = "这是一条包含敏感词的消息：敏感词1";
$result = filterMessage($message);

if ($result === false) {
    echo "消息包含敏感词，不允许发送！";
} else {
    echo "过滤后的消息：" . $result;
}
?>

It should be noted that the construction of sensitive lexicon needs to be carried out according to the actual situation, and it must also be updated and maintained regularly to ensure the accuracy of sensitive words.

Summary:
Through the above introduction, we understand the basic principles and implementation methods of message filtering and sensitive word processing using PHP to implement real-time chat function. Message filtering and sensitive word processing in the real-time chat function are crucial to maintaining the user experience and the security of the platform. Through reasonable algorithms and appropriate sensitive lexicon, message filtering and sensitive word processing can be effectively carried out to protect users. user experience and platform security.

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