stream-gpt-openai.php

<?php

use PhpLlm\LlmChain\Bridge\OpenAI\GPT;
use PhpLlm\LlmChain\Bridge\OpenAI\PlatformFactory;
use PhpLlm\LlmChain\Chain;
use PhpLlm\LlmChain\Model\Message\Message;
use PhpLlm\LlmChain\Model\Message\MessageBag;
use Symfony\Component\Dotenv\Dotenv;

require_once dirname(__DIR__).'/vendor/autoload.php';
(new Dotenv())->loadEnv(dirname(__DIR__).'/.env');

if (empty($_ENV['OPENAI_API_KEY'])) {
    echo 'Please set the OPENAI_API_KEY environment variable.'.PHP_EOL;
    exit(1);
}

$platform = PlatformFactory::create($_ENV['OPENAI_API_KEY']);
$llm = new GPT(GPT::GPT_4O_MINI);

$chain = new Chain($platform, $llm);
$messages = new MessageBag(
    Message::forSystem('You are a thoughtful philosopher.'),
    Message::ofUser('What is the purpose of an ant?'),
);
$response = $chain->call($messages, [
    'stream' => true, // enable streaming of response text
]);

foreach ($response->getContent() as $word) {
    echo $word;
}
echo PHP_EOL;