PHP implements text-to-speech function in WeChat mini program

With the popularity of social tools and the continuous popularity of smartphones, I believe everyone can experience the benefits and convenience of communicating by sending voice messages. In daily life, we can easily use the voice input and speech synthesis functions of smartphones to complete voice text input and text output. However, for some web applications, they do not come with these functions, so we need to use some third-party services to implement these functions. This article will introduce how to use PHP language to implement text-to-speech function in WeChat applet.

Pre-knowledge preparation

Before we start, we need some basic knowledge:

• Basic development knowledge of WeChat applet;
• PHP Basic knowledge of language;
• Basic principles of text-to-speech;
• Basic knowledge of HTTP requests and responses.

Basic principles of text-to-speech

Speech synthesis is a technology that converts text information into sound information. Its principle is based on phonemes, tones, syllables, language grammar, etc. Information, using synthesis algorithms to convert text into sound. There are many technologies to implement speech synthesis, among which the most widely used ones are HMM-based speech synthesis technology and neural network-based speech synthesis technology.

Basic knowledge of HTTP requests and responses

In the process of making HTTP requests, we need to use the HTTP protocol. The HTTP protocol generally contains the following parts:

• Request header: The request header contains the basic information of the request, such as request method, request path, request parameters, request headers and other information.
• Request body: The request body contains the entity content of the HTTP request, such as parameters and files in the POST request.
• Response header: The response header contains the status code, data type, response header and other information returned by the server.
• Response body: The response body contains the actual data content returned by the server.

When making HTTP requests through PHP, we can use the CURL library to implement this process. The specific implementation process is as follows:

• Initialize the CURL instance and set related options.
• Send a request and set the request header, request body and other information.
• Receive the response result and parse the request header, request body and other information.

Implementation process

Next let’s take a look at how to use PHP to implement the text-to-speech function in the WeChat applet.

Step 1: Apply for the Access Token of Baidu Voice API

Before using the Baidu Voice API to implement the text-to-speech function, you need to apply for the Access Token of the Baidu Voice API. Access Token is mainly used for identity verification of various services on Baidu AI open platform and needs to be billed based on the amount of requests.

The method to obtain Access Token is as follows:

• First, you need to register an account on Baidu AI Open Platform and create an application.
• Then, when creating an application, you need to select the "speech synthesis" function and configure the application information.
• Finally, you can obtain the Access Token on the application management page.

Step 2: Write PHP script

1. Install the CURL module

In the PHP language, we need to use the CURL module to implement HTTP Request and response functions. Therefore, before implementing the text-to-speech function, we need to ensure that the CURL module has been correctly installed and enabled.

2. Implement the PHP code to obtain Access Token

The PHP code to obtain Access Token is as follows:

const ACCESS_TOKEN_URL = 'https://aip.baidubce.com/oauth/2.0/token';

function getAccessToken()
{
    $url = ACCESS_TOKEN_URL;
    
    $params = array(
        'grant_type' => 'client_credentials',
        'client_id' => '********',
        'client_secret' => '********',
    );
    
    $options = array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HEADER => false,
        CURLOPT_POST => count($params),
        CURLOPT_POSTFIELDS => http_build_query($params),
    );
    
    $ch = curl_init($url);
    curl_setopt_array($ch, $options);
    
    $response = curl_exec($ch);
    
    $result = json_decode($response, true);
    
    if (! isset($result['access_token'])) {
        return false;
    }
    
    return $result['access_token'];
} 

Among them:

• $url is the API address of the request;
• $params is the parameter array of the request;
• $options is the options of the CURL request, including the request method, request header, request body and other information. For example, if CURLOPT_RETURNTRANSFER is true, it means that the request will return the result instead of outputting it directly to the screen;
• $response is the original data returned by the request;
• $result is to convert $response into an array The result afterwards.

By calling this function, we can obtain the Access Token of Baidu Speech API and use it as a valid authentication for subsequent speech synthesis requests.

3. The PHP code to implement text-to-speech

The PHP code to convert text-to-speech is as follows:

const TEXT_TO_SPEECH_URL = 'https://tsn.baidu.com/text2audio';

function textToSpeech($text, $access_token)
{
    $url = TEXT_TO_SPEECH_URL;
        
    $params = array(
        'tex' => urlencode($text),
        'cuid' => 'PHP TEXT TO SPEECH',
        'lan' => 'zh',
        'ctp' => '1',
        'spd' => '5',
        'vol' => '15',
        'per' => '0',
        'aue' => '3',
        'tok' => $access_token,
    );
    
    $options = array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HEADER => false,
        CURLOPT_POST => count($params),
        CURLOPT_POSTFIELDS => http_build_query($params),
    );
    
    $ch = curl_init($url);
    curl_setopt_array($ch, $options);
    
    $response = curl_exec($ch);
    
    return $response;
}

Among them:

• $text is the text information that needs to be converted into speech;
• $acess_token is the access token obtained;
• $params is the parameter array of the request, including the text information that needs to be synthesized, Information such as the language used, the sounds used, and so on.

By calling this function, we can convert the text information into a voice file in MP3 format and return it to the caller.

Step 3: Call the PHP script in the WeChat applet and implement the text-to-speech function

Using PHP in the WeChat applet to implement the text-to-speech function can be divided into the following steps :

• Write relevant code in the mini program page to obtain the text information that needs to be converted;
• Call the PHP script on the mini program side and convert the text information that needs to be converted Passed to the script as a parameter;
• Parse the voice file returned by the PHP script and play it through the player.

The specific implementation process is relatively complicated and will not be described in detail in this article. Readers can implement this function by referring to relevant documents and tutorials.

Summarize

This article introduces how to use PHP language to implement text-to-speech function in WeChat applet. By using the CURL library, we can easily implement the HTTP request and response process, and convert text information into voice information by calling Baidu Voice API. I hope this article can be helpful to readers.

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