Detailed explanation of the mall keyword filtering function developed with PHP

Detailed explanation of mall keyword filtering function developed with PHP

Mall website is the most common website form in the e-commerce industry. In order to protect users’ information security and provide a good user experience, mall websites often Keyword filtering function needs to be added. The keyword filtering function can detect and filter keywords entered by users to prevent the spread of malicious information and the appearance of inappropriate content. This article will introduce in detail how to use PHP to develop a mall keyword filtering function and provide code examples.

Principle of keyword filtering
The core principle of keyword filtering function is to detect and filter the content input by the user. The specific steps are as follows:

1. Get the content input by the user.
2. Compare the content with the preset keyword list.
3. If the content contains keywords, replace them with specified characters or perform other processing.
4. Return the processed content to the user or save it to the database.

Establishment of keyword table
Before developing the keyword filtering function, you first need to establish a keyword table. The keyword table is a database table or text file that contains keywords that need to be filtered. Common keywords can be obtained from public resources, or keywords can be customized according to the characteristics and needs of the mall website. The establishment of the keyword table needs to take into account the trade-off between filtering efficiency and accuracy.

The sample code for using MySQL database to create a keyword table is as follows:

CREATE TABLE keywords (
  id INT(11) AUTO_INCREMENT PRIMARY KEY,
  keyword VARCHAR(255) NOT NULL,
  replacement VARCHAR(255) NOT NULL
);

INSERT INTO keywords (keyword, replacement) VALUES
  ('关键词1', '***'),
  ('关键词2', '***'),
  ('关键词3', '***');

PHP code to implement keyword filtering function
In PHP, you can use regular expressions to match keywords and replacement. The following is a simplified PHP function code example that implements keyword filtering:

function keywordFilter($input) {
  $keywords = [
    ['关键词1', '***'],
    ['关键词2', '***'],
    ['关键词3', '***']
  ];

  foreach ($keywords as $keyword) {
    $pattern = '/' . $keyword[0] . '/i';
    $replacement = $keyword[1];
    $input = preg_replace($pattern, $replacement, $input);
  }

  return $input;
}

The above code defines a function named keywordFilter, which accepts an input parameter $input , and return the filtered content. The function uses the preg_replace function to match and replace keywords based on the keywords in the keyword table to implement keyword filtering.

The sample code is used as follows:

$input = $_POST['input']; // 获取用户输入的内容
$output = keywordFilter($input); // 调用关键词过滤函数
echo $output; // 输出过滤后的内容

It should be noted that the keyword filtering function can only be used as an auxiliary means to improve the security and user experience of the website, and cannot completely replace other security measures. . At the same time, the accuracy and efficiency of keyword filtering also need to be continuously optimized and improved.

Summary
This article introduces in detail how to use PHP to develop a mall keyword filtering function, and provides relevant code examples. The keyword filtering function is one of the important means to protect the security of user information on the mall website and provide a good user experience. We hope that the introduction in this article can help readers better understand and implement the keyword filtering function.

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