Text-to-Speech in PHP: How to Use External APIs

To use text-to-speech (TTS) in PHP, you can use an external TTS API or library that converts text to speech. Here's an example of how to use the Google Text-to-Speech API in PHP:

 // Set the text to speak
$text = 'Hello, world!';

// Set the language code and voice name
$languageCode = 'en-US';
$voiceName = 'en-US-Wavenet-A';

// Set the API key and URL
$apiKey = 'YOUR_API_KEY';
$url = 'https://texttospeech.googleapis.com/v1/text:synthesize?key=' . $apiKey;

// Set the request body JSON data
$data = [
  'input' => [
    'text' => $text
  ],
  'voice' => [
    'languageCode' => $languageCode,
    'name' => $voiceName
  ],
  'audioConfig' => [
    'audioEncoding' => 'MP3'
  ]
];

// Send the POST request to the API
$options = [
  'http' => [
    'method' => 'POST',
    'header' => 'Content-Type: application/json',
    'content' => json_encode($data)
  ]
];
$context = stream_context_create($options);
$response = file_get_contents($url, false, $context);

// Save the audio file
$file = 'audio.mp3';
file_put_contents($file, $response);

In this example, we start by setting the text to speak, the language code, and the voice name (e.g. 'en-US-Wavenet-A'). We then set the API key and URL for the Google Text-to-Speech API.

Next, we create a JSON data object that contains the input text, voice settings, and audio encoding. We then send a POST request to the API using file_get_contents() with the JSON data in the request body.

Finally, we save the audio file to disk using file_put_contents(). Note that you may need to configure your server or PHP settings to enable external HTTP requests and file writing.