Natural language processing and keyword extraction techniques for PHP and small programs

Natural Language Processing and Keyword Extraction Skills of PHP and Mini Programs

In today’s era of information explosion, Natural Language Processing (NLP) and keyword extraction have become popular in the field of information processing technology. As a scripting language widely used in web development, PHP is favored by developers for its simplicity, ease of use and powerful functions. WeChat mini programs have become the mainstream choice for mobile application development. This article will introduce how to use PHP and small programs to implement natural language processing and keyword extraction techniques, and come with code examples.

1. Natural language processing in PHP

PHP provides a wealth of text processing functions and libraries that can be used to implement various functions of natural language processing. Here are some commonly used natural language processing techniques.

(1) Word segmentation

Word segmentation is the first step in natural language processing, which divides the input text into a sequence of words or tags. You can use the explode function in PHP to implement a simple word segmentation function. For example, the following code splits a sentence into words:

$words = explode(' ', $sentence);

In addition to the explode function, you can also use some open source word segmentation libraries, such as Jieba and the Chinese Academy of Sciences ICTCLAS Chinese word segmentation system.

(2) Lemmatization and part-of-speech tagging

Lemmatization and part-of-speech tagging are the processes of normalizing and classifying words. PHP provides some libraries to implement these functions, such as NLTK library and textblob library. You can use these libraries to perform lemmatization and part-of-speech tagging operations on words in text.

(3) Sentiment analysis

Sentiment analysis is a common natural language processing task, which is used to determine the emotional tendency in text, such as positive, negative or neutral. Some libraries can be used in PHP, such as SentiStrength and textblob libraries, to implement sentiment analysis functions. The following is a sample code that uses the textblob library to implement sentiment analysis:

$blob = TextBlob($text);
$sentiment = $blob->sentiment;
echo $sentiment;

2. Natural language processing and keyword extraction in applet

The applet is a lightweight Level mobile applications, usually running on WeChat clients. Although the functions of mini programs are relatively limited, some technologies can also be used to implement natural language processing and keyword extraction functions.

(1) Word segmentation

The applet can use the open interface officially provided by WeChat, such as the wx.request interface, to obtain the word segmentation results from the server. The server side can use PHP to implement the word segmentation function and return the results to the applet. The following is a sample code that uses a small program to call the server-side word segmentation function:

wx.request({
  url: 'https://your-server.com/segmentation.php',
  method: 'POST',
  data: {
    text: '这是一个示例文本'
  },
  success: function(res) {
    console.log(res.data);
  }
});

The PHP server code is as follows:

$text = $_POST['text'];
$words = explode(' ', $text);
echo json_encode($words);

(2) Keyword extraction

Keyword extraction It is one of the important tasks of natural language processing, which can extract representative keywords from text. The applet can call the keyword extraction interface provided by the PHP server to implement the keyword extraction function. The following is a sample code that uses a small program to call the server-side keyword extraction function:

wx.request({
  url: 'https://your-server.com/keyword_extraction.php',
  method: 'POST',
  data: {
    text: '这是一个示例文本'
  },
  success: function(res) {
    console.log(res.data);
  }
});

The PHP server code is as follows:

$text = $_POST['text'];
$keywords = extract_keywords($text);
echo json_encode($keywords);

The extract_keywords function in the above code is A custom keyword extraction function, you can implement this function according to actual needs.

To sum up, this article introduces the techniques of natural language processing and keyword extraction in PHP and small programs, and provides corresponding code examples. I hope these tips can help developers apply natural language processing and keyword extraction technology in actual projects.

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