[METHOD] Get Human-like Text To Speech Voices

<?php
/**
USAGE

1. You must have composer installed, if not, https://getcomposer.org
2. in a terminal, run `composer install`
3. Change to your aws keys in the top of the file. You can signup on AWS for free.
4. change text and output file and voice in function synthesizeSpeech

*/

putenv("AWS_ACCESS_KEY_ID=xxxxxxxxxxx"); // replace xxxx with your access key (free)
putenv("AWS_SECRET_ACCESS_KEY=xxxxxxxxxxxx"); // replace with your secret key

require_once(__DIR__ . "/vendor/autoload.php"); // autoload all dependencies
use Aws\Exception\AwsException;
use Aws\Polly\PollyClient;

/**
* Calls polly and saves speechfile to outputfile
*/
function synthesizeSpeech($text, $outputfile, $voice = "random") {
    $voices = [
        "Geraint",    "Gwyneth",    "Mads",    "Naja",    "Hans",    "Marlene",    "Nicole",    "Russell",    "Amy",    "Brian",    "Emma",    "Raveena",    "Ivy",    "Joanna",    "Joey",    "Justin",     "Kendra",     "Kimberly",     "Matthew",     "Salli",     "Conchita",     "Enrique",
         "Miguel",     "Penelope",     "Chantal",     "Celine",     "Lea",     "Mathieu",     "Dora",     "Karl",     "Carla",     "Giorgio",     "Mizuki",     "Liv",     "Lotte",     "Ruben",     "Ewa",     "Jacek",     "Jan",     "Maja",     "Ricardo",     "Vitoria",      "Cristiano",
         "Ines",     "Carmen",     "Maxim",     "Tatyana",     "Astrid",     "Filiz",     "Vicki",     "Takumi",     "Seoyeon",     "Aditi",     "Zhiyu",     "Bianca",     "Lucia",     "Mia"
    ];
    if($voice == "random")$voice = $voices[ rand(0,count($voices)-1)];
    $format = "mp3";
    $credentials = new Aws\Credentials\Credentials(getenv('AWS_ACCESS_KEY_ID'), getenv('AWS_SECRET_ACCESS_KEY'));
    $client = new Aws\Polly\PollyClient([
        'version' => '2016-06-10',
        'region' => 'us-east-2',
        'credentials' => [
            'key'    => getenv('AWS_ACCESS_KEY_ID'),
            'secret' => getenv('AWS_SECRET_ACCESS_KEY'),
        ],
    ]); 
    try {
        $result = $client->synthesizeSpeech([
            'Text' => $text,
            'TextType' => 'text',
            'OutputFormat' => $format,
            'VoiceId' => $voice,
  
        ]);
        $song = $result->get('AudioStream')->getContents();
        file_put_contents($outputfile, $song);
    } catch (AwsException $e) {
        // output error message if fails
        echo $e->getMessage();
        echo "\n";
    } 
}

// example one, write one file
synthesizeSpeech("Get fifty-percent discount. Sign up today.", "output.mp3", "random");

// example two, synthesize a whole book
$files=[
    'chapter1.txt',
    'chapter2.txt',
    'chapter3.txt',
       ];

foreach($files as $file) {
    $data = file_get_contents(__DIR__."/".$file);
    synthesizeSpeech($data, $file.".mp3", "Astrid");
    die();
}