How to filter banned words in php? Brief analysis of methods

PHP is a widely used server-side scripting language that can be used to develop many types of applications, including websites, web applications, command line tools, etc. In the web development process, filtering banned words is a very important task, involving the security and customer experience of the website or application. In this article, we will introduce how to filter banned words using PHP.

What are prohibited words?

Prohibited words refer to words or sensitive words that users cannot use on websites or applications. These words may include obscene words, personal attacks, malicious words, etc. Violating these regulations will result in the user's account being banned, blocked, or even prosecuted.

Why do we need to filter banned words?

For a website or application, filtering banned words is a very important task. This not only ensures the user experience, but also ensures the security of the website or application and prevents malicious users from causing adverse effects through inappropriate remarks.

How to use PHP to filter banned words?

In PHP, filtering banned words usually includes the following steps:

1. Get the text content that needs to be filtered

First you need to Get the text content that needs to be filtered, which is usually comments, messages, articles, etc. posted by users. This can be achieved by getting the text content in a POST or GET request.

2. Compare the text content that needs to be filtered with the banned word list

In PHP, you can use the in_array() function or preg_match() function for comparison. . Among them, the in_array() function can determine whether a string is in an array, and the preg_match() function can use regular expressions to match text content. During the comparison process, you can use keyword masking or "*" to replace keywords to achieve filtering.

3. Filter prohibited words

If the text is found to contain prohibited words during the comparison process, you can use the function str_replace() or preg_replace() to filter the text content . Among them, the str_replace() function can replace all matching items in a string, while the preg_replace() function can replace matching items using regular expressions.

4. Return the filtered text content

After completing the filtering, the filtered text content needs to be returned to the user or stored in a database or other location.

The following is a sample code for PHP to filter banned words:

<?php function filterWords($text, $words) {
    foreach ($words as $word) {
        $len = mb_strlen($word, &#39;utf-8&#39;);
        $replace = str_repeat(&#39;*&#39;, $len);
        $text = preg_replace("/$word/u", $replace, $text);
    }
    return $text;
}

// 示例数据
$text = &#39;这个评论中有色情词汇和敏感信息，需要进行过滤!&#39;;
$words = array(&#39;色情&#39;, &#39;敏感信息&#39;, &#39;过滤&#39;);

// 过滤文本内容
$result = filterWords($text, $words);

// 输出结果
echo $result;

// 输出结果：这个评论中有****词汇和****，需要进行****
?>

The above is a sample code for PHP to filter banned words. In this code, we define a function filterWords(), which accepts the text content that needs to be filtered and the array of words to be filtered. We then use regular expressions to match words in the text content and generate "*" replacement matches through the str_repeat() function. Finally, the filtered text content is returned. As you can see, this code implements a simple and efficient function of filtering banned words.

Conclusion

Filtering banned words is a common task in web development and is crucial to ensuring the security and user experience of a website or application. In this article, we introduce how to use PHP to filter banned words and provide a simple and efficient sample code. Hope this article is helpful to you.

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