How to use PHP to implement the voice chat function in WeChat mini program

With the development of mobile Internet, people's social and communication methods are also constantly changing. As a lightweight application owned by Tencent, WeChat Mini Program has attracted more and more attention and use.

The voice chat function in the WeChat mini program provides users with a new way of expressing and listening. This article will introduce how to use PHP to implement the voice chat function in WeChat applet.

1. Introduction to the voice talking function of WeChat Mini Program

The voice talking function of WeChat Mini Program is a communication method based on speech recognition technology. Users can click the voice talk button on the mini program page to record a piece of their own voice, upload it to the server for voice recognition, and then obtain the voice text content. In this way, users can express their emotions and thoughts through voice, and can also leave messages and reply in the form of voice text.

2. Implementation process of the voice talking function

To implement the voice talking function in the WeChat mini program, you need to complete the following steps:

1. Create a mini program page

First, create a mini program page in WeChat developer tools. Add a voice talk button to the page to trigger the recording function. At the same time, a text box for displaying the recognition results needs to be added to the page.

2. Implementation of the recording function

After the user clicks the voice talk button, the voice recording function needs to be implemented. In the WeChat applet, you can use the wx.getRecorderManager() method to obtain the recording manager object, and then use the start() method of the object to start recording.

After the recording is completed, upload the recording file to the server for speech recognition. When uploading, you need to use the wx.uploadFile() method provided by the mini program to perform the upload operation.

3. Implementation of the speech recognition function

After the upload is completed, the recording file uploaded to the server needs to be speech recognized. In PHP, you can use Baidu's speech recognition API for processing.

To use the Baidu Speech Recognition API, you need to first register and create an application in the Baidu Developer Center, and then obtain the API Key and Secret Key. In the PHP code, the speech recognition operation is implemented by sending a POST request to the Baidu API interface. For specific code implementation, please see the code example below.

4. Display the recognition results

After the speech recognition operation is completed, the recognition results will be displayed through the text box for the user to view and reply.

3. Code example for implementing the voice talking function in the WeChat applet using PHP

The following code shows how to use PHP to implement the voice talking function in the WeChat applet. You need to use the speech recognition API of Baidu AI open platform, so you need to register and create an application in the Baidu Developer Center in advance.

//Get the API Key and Secret Key of Baidu AI Open Platform
define('API_KEY', 'your_api_key_here');
define('SECRET_KEY ', 'your_secret_key_here');

//Function: Get Baidu API access Token
function getBaiduAccessToken() {

//向接口发送POST请求，获取访问Token
$url = 'https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id='.API_KEY.'&client_secret='.SECRET_KEY;
$res = json_decode(file_get_contents($url), true);
return $res['access_token'];

}

//Function: Voice Identification interface
function voice2text($filename) {

//获取访问Token
$token = getBaiduAccessToken();

//通过语音识别API接口，进行语音转文字识别
$url = 'https://vop.baidu.com/server_api';
$post_data = array(
    'format' => 'wav',
    'rate' => 16000,
    'channel' => 1,
    'token' => $token,
    'cuid' => uniqid(),
    'len' => filesize($filename),
    'speech' => base64_encode(file_get_contents($filename))
);
$header[] = 'Content-type:application/json';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($post_data));
$res = curl_exec($ch);
curl_close($ch);

//解析识别结果
$res = json_decode($res, true);
if(isset($res['result'][0])) {
    return $res['result'][0];
} else {
    return '无法识别该语音';
}

}

//Get the recording file submitted by the applet
$file = $_FILES['voicefile'];

//Move the file to the specified directory
$filename = time().'-'.mt_rand(1000,9999).'.wav';
if(move_uploaded_file($file[' tmp_name'], 'uploads/'.$filename)) {

//调用语音识别接口，获取识别结果
$text = voice2text('uploads/'.$filename);

//返回识别结果给小程序端
echo '{"text":"'.$text.'"}';

} else {

echo '{"text":"文件上传失败"}';

}

?>

Code implementation in progress , obtain the access token of Baidu AI open platform by calling the getBaiduAccessToken() function, call the Baidu speech recognition API through the voice2text() function to perform speech recognition operations, and finally return the recognition results to the applet.

4. Summary

This article introduces how to use PHP to implement the voice talking function in the WeChat applet. By using the speech recognition API of Baidu AI open platform, the operation of converting speech files into text is realized. This can provide users with a more convenient and natural way of communication, and also provide program developers with more room for creation and innovation.

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