How to use PHP to implement the sensitive word filtering function of CMS system

How to use PHP to implement the sensitive word filtering function of the CMS system

With the widespread application of the Internet, CMS systems such as blogs and forums have become important platforms for people to communicate and share information. However, some uncivilized and unhealthy remarks and content also followed. In order to maintain a healthy and friendly network environment, we need to add a sensitive word filtering function to the CMS system to block or replace sensitive words. This article will teach you how to use PHP to implement the sensitive word filtering function of the CMS system and provide corresponding code examples.

1. Build a sensitive vocabulary library
First, we need to build a sensitive vocabulary library. Sensitive vocabulary can contain various types of sensitive words, such as words involving politics, pornography, violence, etc. Sensitive lexicon can exist in the form of an array or text file to facilitate subsequent use. The following is a simple example sensitive word library:

$sensitiveWords = [
    '政治',
    '色情',
    '暴力',
    '违禁',
];

2. Implement the sensitive word filtering function
Next, we need to implement the sensitive word filtering function. First, we need to define a function that will receive a string parameter, filter or replace the sensitive words in it with symbols, and then return the filtered string.

The following is an example function that uses PHP regular expressions to implement sensitive word filtering:

function filterSensitiveWords($content, $sensitiveWords) {
    foreach($sensitiveWords as $word) {
        $pattern = '/'. $word .'/i';
        $replacement = '***'; //替换敏感词的符号
        $content = preg_replace($pattern, $replacement, $content);
    }

    return $content;
}

3. Apply the sensitive word filtering function in the CMS system
In the CMS system, we can Apply sensitive word filtering to articles or comments posted by users. Before users submit articles or comments, call the above filterSensitiveWords function to filter the content.

The following is a simple sample code that demonstrates how to use the sensitive word filtering function in the article publishing function of the CMS system:

function publishArticle($title, $content) {
    $filteredContent = filterSensitiveWords($content, $sensitiveWords);

    // 将过滤后的文章保存到数据库或其他数据存储方式中

    // 其他处理逻辑
}

4. Optimize the performance of the sensitive word filtering function
Sensitive The word filtering function may have a certain impact on the performance of the system, especially when the sensitive vocabulary library is very large. In order to improve performance, we can consider the following optimization strategies:

1. Use hash table indexing of sensitive words: Index the sensitive words in the sensitive vocabulary database in the form of a hash table for faster Find and match sensitive words.
2. Use multi-threading or asynchronous processing: If the system allows it, the sensitive word filtering function can be processed in an independent thread or process to make full use of the system's multi-core processing capabilities.
3. Cache sensitive word filtering results: Cache sensitive word filtering results to avoid repeated filtering operations on the same content, thus improving performance.

Summary:
Through the above steps and sample code, we can easily implement the sensitive word filtering function of the CMS system in PHP. However, sensitive word filtering is only a means. We also need to combine other methods and strategies to build a healthy and friendly network environment.

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