OpenAI APIを使用した簡単なリクエストのPHPコード chatGPT

<?php

$apiKey = 'APIキー';
$endpoint = 'https://api.openai.com/v1/chat/completions';

$headers = array(
    'Content-Type: application/json',
    'Authorization: Bearer ' . $apiKey
);

$user_question = isset($_POST['user_question_s']) ? $_POST['user_question_s'] : '';

$article = array(
    'model' => 'gpt-3.5-turbo',
    'messages' => [
        [
            'role' => 'system',
            'content' => '口コミで使える文章を口コミと言う言葉を使わずに50文字の日本語で考えて'
        ],
        [
            'role' => 'user',
            'content' => $user_question
        ]
    ],
    'max_tokens' => 100
);