Using google TTS API with PHP

run-tts-google-api.php

<?php
require_once 'vendor/autoload.php';

// Function to convert text to speech using Google Cloud Text-to-Speech API
function textToSpeech($text, $serviceAccountPath) {
    // Create and configure a new client object
    $client = new Google_Client();
    $client->setAuthConfig($serviceAccountPath);
    $client->addScope('https://www.googleapis.com/auth/cloud-platform');
    $httpClient = $client->authorize();

    // Google Text-to-Speech API URL
    $url = 'https://texttospeech.googleapis.com/v1/text:synthesize';

    // The text and voice configuration
    $data = [
        "input" => ["text" => $text],
        "voice" => ["languageCode" => "pt-PT", "ssmlGender" => "FEMALE"],
        "audioConfig" => ["audioEncoding" => "MP3"]
    ];

    // Make the request
    $response = $httpClient->post($url, [
        'json' => $data
    ]);

    // Decode the JSON response
    $responseDecoded = json_decode($response->getBody(), true);

    // Check if the API call was successful
    if (isset($responseDecoded['audioContent'])) {
        // Decode the audio content and save it as an MP3 file
        file_put_contents("output.mp3", base64_decode($responseDecoded['audioContent']));
        echo "Audio content written to 'output.mp3'\n";
    } else {
        // Output error message
        echo "Failed to convert text to speech.\n";
        if (isset($responseDecoded['error']['message'])) {
            echo "Error message: " . $responseDecoded['error']['message'] . "\n";
        }
    }
}

// Path to your service account JSON key
$serviceAccountPath = __DIR__ .'/google-tts-credentials.json';

// The text you want to convert to speech
$text = "Boa tarde Hugo, como te posso ajudar?";

// Call the function
textToSpeech($text, $serviceAccountPath);
?>