PHP Integration with Baidu Text-to-Speech API: Detailed Steps and Implementation Guide

1. Introduction

Baidu Text-to-Speech API allows you to convert text into speech, which can be widely used in voice interaction, navigation, broadcasting, automotive, and other fields. This article will explain in detail how to integrate Baidu Text-to-Speech API with PHP, helping developers quickly implement speech synthesis features.

2. Preparation

Before you start writing PHP code, there are a few preparatory steps you need to complete:

2.1 Register a Baidu Developer Account

First, register a Baidu developer account, log in to the Baidu AI open platform, create a new application, and enable the Speech Technology Service.

2.2 Create an Application

After registration, you need to create an application. The steps are as follows:

• Go to the Baidu AI open platform and click on "Console".
• In the console page, select "My Applications" and then click "Create a New Application".
• Fill in the relevant information and complete the creation process.

Once the application is created, you can find the "App ID" and "API Key" information in the "My Applications" section.

2.3 Set Up the PHP Environment

Before writing PHP code, ensure that your PHP environment is properly set up. Follow these steps:

• Download and install PHP.
• Start the PHP service.
• Create a PHP file locally and test it.

3. Steps to Integrate Baidu Text-to-Speech API

Once the preparations are complete, the next step is to integrate PHP with the Baidu Text-to-Speech API. The steps are as follows:

3.1 Install Required Extensions

Before calling the Baidu API, make sure your PHP environment has the CURL and JSON extensions installed. You can install them using the following commands:

        sudo apt-get install php-curl
        sudo apt-get install php-json
    

3.2 Construct the API Request Parameters

Before calling the Baidu Text-to-Speech API, you need to construct the request parameters according to the API documentation. Follow these steps:

• Construct the API request URL.
• Base64 encode the text that you want to convert to speech.
• Create a request parameter array that includes language type, speaker, speech speed, pitch, and other parameters.
• Generate the Access Token using App ID, API Key, and Secret Key.
• Submit the Access Token along with the request parameters to the API interface.

Once the request parameters are constructed, use the CURL library to send the API request and parse the returned JSON data.

3.3 Process the API Response

After calling the API, you need to process the returned data to extract the audio file's binary data and save it locally. Below is an example of how to handle the API response:

        $url = 'https://tsn.baidu.com/text2audio';
        $text = 'Baidu Text-to-Speech API Integration';
        $data = array(
            'tex' => base64_encode($text), // Base64 encode the text
            'lan' => 'zh', // Language type
            'tok' => $access_token, // Access Token
            'ctp' => '1', // Client type
            'cuid' => '123456' // Client identifier
        );
        $data = http_build_query($data);
        $url = $url . '?' . $data;

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        $result = curl_exec($ch);
        curl_close($ch);

        // Parse the returned JSON data into an array
        $result_arr = json_decode($result, true);
        // Extract the audio file and save it locally
        $audio = base64_decode($result_arr['data']['audio']);
        file_put_contents('audio.mp3', $audio);
    

4. Conclusion

With this tutorial, you have learned how to integrate the Baidu Text-to-Speech API with PHP. In actual applications, you may also need to consider code optimization, stress testing, and other factors to ensure the stability of the program under high concurrency.