Use PHP to write programs to connect to Baidu Natural Language Processing API

Title: Use PHP to write programs to implement docking with Baidu Natural Language Processing API

Introduction:
Baidu Natural Language Processing (Baidu Natural Language Processing, referred to as NLP) is A set of language processing tools based on artificial intelligence technology. By calling Baidu NLP API, we can implement functions such as text classification, sentiment analysis, and lexical analysis. This article will introduce how to use PHP to write a program to connect to Baidu NLP API to implement text classification.

1. Apply for a Baidu AI open platform account and create an application
First, we need to register an account on the Baidu AI open platform, and then create an application to obtain an Access Token using the Baidu Natural Language Processing API. The specific operation process is as follows:

1. Log in to [Baidu AI Open Platform] (https://ai.baidu.com/) and enter the personal homepage;
2. On the personal homepage, click on the upper right Click the "Activate" button in the corner and select "Baidu Natural Language Processing" in the pop-up window;
3. Enter the "Baidu Natural Language Processing" page and click "Activate Now";
4. In the "Application" Management" page, click "Create Application";
5. Fill in the application name, application description and other information, and select "Security Authentication Mode" as "Normal Version";
6. After the creation is completed, enter the application On the details page, obtain the API Key and Secret Key.

2. Install PHP SDK and related extensions
In order to use Baidu Natural Language Processing API, we need to use a third-party PHP SDK. Here, we choose to use the officially provided Baidu Aip PHP SDK. The following are the installation steps:

1. Visit [GitHub](https://github.com/Baidu-AIP/sdk-php) and download the Baidu Aip PHP SDK source code package;
2. Extract the downloaded source code package to the project directory and perform relevant configurations.

At the same time, in order to use Baidu Natural Language Processing API, you also need to ensure that the curl extension is installed in the PHP environment. If it is not installed, you can use the following command to install the curl extension:

$ sudo apt-get install php-curl

3. Use PHP to write programs
The following is a docking program written in PHP Sample code of Baidu Natural Language Processing API:

setConnectionTimeoutInMillis(3000);
$aipNlp->setSocketTimeoutInMillis(3000);

// 定义待分类的文本
$text = '我喜欢这部电影，情节紧凑，角色饱满。';

// 调用API实现文本分类
$res = $aipNlp->lexer($text);

// 输出分类结果
if (!empty($res['items'])) {
    foreach ($res['items'] as $item) {
        echo '词汇：' . $item['item'] . '，分类：' . $item['pos'] . PHP_EOL;
    }
} else {
    echo '文本分类失败！' . PHP_EOL;
}
?>

In the above sample code, we first import the PHP SDK file of Baidu Natural Language Processing API, and set the Access Token, API Key and Secret Key of Baidu API. Then, create an AipNlp instance and set the HTTP header information. Next, we define the text to be classified and call the API's lexical analysis interface lexer to implement text classification.

4. Run the program
In order to run the above sample code, we need to replace the obtained Access Token, API Key and Secret Key with the corresponding variables in the code. Then, execute the following command in the terminal:

$ php filename.php

After executing the program, if everything goes well, the results of text classification will be output.

Conclusion:
Through the introduction of this article, we have learned how to use PHP to write programs and connect to Baidu Natural Language Processing API to implement text classification functions. I hope this article can help readers quickly get started with Baidu Natural Language Processing API and use its powerful functions in practical applications.

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