How to implement speech recognition in PHP

With the continuous development of artificial intelligence technology, speech recognition technology is becoming more and more popular. In Web development, implementing speech recognition has also become an important task.

PHP, as a language widely used in the field of web development, can also implement speech recognition. In this article, we will introduce how to implement speech recognition in PHP.

1. Using Baidu Speech Recognition API

Baidu Speech Recognition API is one of the more mature and popular speech recognition APIs at present. Speech recognition function can be easily implemented using Baidu Speech Recognition API.

First, you need to register and create an application on the Baidu Developer Platform, and obtain the App ID and App Key of the application.

Then, you need to use PHP to send a POST request to transfer the voice file to Baidu Speech Recognition API. The following is a sample code:

//语音文件路径
$audio_file = "audio.pcm";

//将语音文件读取为字符串
$file_content = file_get_contents($audio_file);

//设置POST请求的header
$header = array(
    "Content-Type: audio/pcm;rate=8000",
    "Content-Length: " . strlen($file_content),
    "Referer: http://yuyin.baidu.com/"
);

//构造POST请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://vop.baidu.com/server_api");
curl_setopt($ch, CURLOPT_POSTFIELDS, $file_content);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);

//设置App ID和App Key
$app_id = "your_app_id";
$app_key = "your_app_key";
curl_setopt($ch, CURLOPT_USERPWD, $app_id . ":" . $app_key);

//发送POST请求
$response = curl_exec($ch);

//解析返回结果
$result = json_decode($response, true);
if (isset($result['result'][0])) {
    echo $result['result'][0];
}
else {
    echo "识别失败";
}

2. Using Google Speech Recognition API

In addition to Baidu Speech Recognition API, Google Speech Recognition API is also a very mature and popular speech recognition API. . Speech recognition functionality can also be easily implemented using the Google Speech Recognition API.

First, you need to create a project in the Google Cloud Console and enable the Google Cloud Speech-to-Text API.

Then, you need to use PHP to send a POST request to transfer the voice file to the Google Speech Recognition API. The following is a sample code:

//语音文件路径
$audio_file = "audio.flac";

//将语音文件读取为字符串
$file_content = file_get_contents($audio_file);

//构造POST请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://speech.googleapis.com/v1/speech:recognize");
curl_setopt($ch, CURLOPT_POSTFIELDS, $file_content);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);

//设置API密钥
$api_key = "your_api_key";
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json",
                                           "Authorization: Bearer ".$api_key));

//设置请求体
$request_data = array(
    "config" => array(
        "encoding" => "FLAC",
        "sampleRateHertz" => 16000,
        "languageCode" => "zh-CN",
    ),
    "audio" => array(
        "content" => base64_encode($file_content),
    ),
);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($request_data));

//发送POST请求
$response = curl_exec($ch);

//解析返回结果
$result = json_decode($response, true);
if (isset($result['results'][0]['alternatives'][0]['transcript'])) {
    echo $result['results'][0]['alternatives'][0]['transcript'];
}
else {
    echo "识别失败";
}

Summary

The above are two ways to implement speech recognition in PHP: using Baidu Speech Recognition API and using Google Speech Recognition API. These two methods are relatively mature and popular in realizing speech recognition. Which method to choose can be chosen according to actual needs and personal preferences.

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