Teach you step by step how to use PHP to connect to Baidu Image Recognition API

Teach you step by step how to use PHP to connect to Baidu Image Recognition API

Introduction:
Image recognition is a popular technology in the field of artificial intelligence, which enables computers to Objects and features are identified in pictures. The Baidu Image Recognition API is a tool that realizes automatic image recognition by calling the image recognition interface provided by Baidu. This article will provide a detailed introduction and demonstration of the PHP language.

Step 1: Apply for API Key and Secret Key
First, you need to register and log in to your account on Baidu Open Cloud Platform (cloud.baidu.com). After creating the application, obtain the corresponding API Key and Secret Key. These two parameters will be used in subsequent calls.

Step 2: Install PHP SDK
Before starting actual development, you need to install Baidu AI’s PHP SDK. Open a terminal or console, enter your project directory, and use the Composer command to install:

composer require baidu/aip-sdk

Step 3: Write code and connect to the API
The following is a simple sample code that shows how to use PHP to connect Baidu image recognition API for text recognition:

<?php
require 'vendor/autoload.php';

use GuzzleHttpClient;
use GuzzleHttpExceptionRequestException;

// 设置API Key和Secret Key
$clientId = '[你的API Key]';
$clientSecret = '[你的Secret Key]';

// 图像文件路径
$image = './test.jpg';

// 初始化HTTP客户端
$client = new Client();

try {
    // 调用百度图像识别API
    $response = $client->post('https://aip.baidubce.com/oauth/2.0/token', [
        'form_params' => [
            'grant_type' => 'client_credentials',
            'client_id' => $clientId,
            'client_secret' => $clientSecret,
        ]
    ]);

    $result = json_decode($response->getBody(), true);
    
    // 获取Access Token
    $accessToken = $result['access_token'];

    // 构建请求URL
    $url = 'https://aip.baidubce.com/rest/2.0/ocr/v1/general_basic';

    // 构建请求参数
    $params = [
        'access_token' => $accessToken,
        'image' => base64_encode(file_get_contents($image)),
    ];

    // 调用API
    $response = $client->post($url, [
        'form_params' => $params,
    ]);

    // 解析返回结果
    $result = json_decode($response->getBody(), true);
    
    // 输出识别结果
    foreach ($result['words_result'] as $word) {
        echo $word['words'] . "
";
    }
} catch (RequestException $e) {
    echo '请求异常：' . $e->getMessage();
}

The above code uses the Guzzle HTTP client library to make HTTP requests. It first calls Baidu API to obtain the Access Token, and then uses the obtained Access Token for image recognition.

Step 4: Run the code
Save the above code as a PHP file (for example image_recognition.php), and use the following command in the command line or terminal to run the code:

php image_recognition.php

Make sure your image file path, API Key, and Secret Key are configured correctly, and then run the code to see the results of image recognition.

Summary:
Through the brief introduction and code examples of this article, you should be able to understand how to use PHP to connect to Baidu Image Recognition API to implement image recognition functions. Hope this can help you apply image recognition technology in PHP projects and bring out its value in various fields.

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