PHP learning steps: How to use sensitive word filtering

PHP learning steps: How to use sensitive word filtering

Introduction:
In the Internet age, freedom of speech also brings the risk of information dissemination. In order to maintain the health of the network environment and provide a user-friendly experience, sensitive word filtering has become an indispensable part. This article will introduce the learning steps of using sensitive word filtering in PHP and provide corresponding code examples.

Step 1: Establish a sensitive word library
To use the sensitive word filtering function, you first need to create a sensitive word library. The sensitive word library is a list containing all sensitive words to be filtered. Sensitive words can be added manually or imported from an existing sensitive word library.

The sensitive vocabulary library can be a text file, each line is a sensitive word, or it can be an array, each element is a sensitive word. After establishing the sensitive vocabulary library, store it in a suitable location so that it can be called in the code.

For example, we can store the sensitive lexicon in a text file named "sensitive_words.txt":

敏感词1
敏感词2
敏感词3
...

Step 2: Load the sensitive lexicon
In PHP , we can use the file_get_contents() function to load the sensitive vocabulary file and store it in an array. The code example is as follows:

$sensitiveWords = file_get_contents('sensitive_words.txt');
$sensitiveWordsArray = explode(PHP_EOL, $sensitiveWords);

The above code reads the sensitive words in the sensitive word library file into the $sensitiveWords variable, and uses the explode() function to split it into an array according to newline characters.

Step 3: Implement the sensitive word filtering function
In PHP, we can use the str_replace() function to implement the sensitive word filtering function. The str_replace() function can replace a certain substring in a string with the specified content. We can match each sensitive word in the sensitive vocabulary library with the text to be filtered, and if there is a sensitive word in the text to be filtered, replace it with the specified content.

The following is an example of a simple sensitive word filtering function:

function filterSensitiveWords($text, $sensitiveWordsArray, $replaceChar = '*') {
    foreach ($sensitiveWordsArray as $word) {
        $text = str_replace($word, $replaceChar, $text);
    }
    return $text;
}

The above code defines a function named filterSensitiveWords(), which receives three parameters: the text to be filtered $text, The sensitive word library array $sensitiveWordsArray, and the optional replacement character $replaceChar, which defaults to "*".

The function replaces each sensitive word with the specified replacement character in the text to be filtered by traversing the sensitive vocabulary array. Finally, the filtered text is returned.

Step 4: Call the sensitive word filtering function
Wherever sensitive words need to be filtered, just call the defined sensitive word filtering function. For example, we can use the sensitive word filtering function when users make comments or post updates.

The following is a simple example:

$sensitiveWords = file_get_contents('sensitive_words.txt');
$sensitiveWordsArray = explode(PHP_EOL, $sensitiveWords);

$userInput = "这是一段含有敏感词的用户输入";
$userInputFiltered = filterSensitiveWords($userInput, $sensitiveWordsArray);

echo $userInputFiltered;

The above code filters the text $userInput entered by the user through the filterSensitiveWords() function for sensitive words, and outputs the filtered results.

Summary:
Using the sensitive word filtering function can effectively maintain the health of the network environment and provide a user-friendly experience. By establishing a sensitive word library, loading the sensitive word library, implementing the sensitive word filtering function and calling it, we can easily implement the sensitive word filtering function. I hope this article can help you master the method of sensitive word filtering in PHP learning.

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