如何通过PHP调用OpenAI Assistant获取响应？端点错误修正求助

你遇到的错误是因为使用了错误的API端点，OpenAI Assistant API不支持直接通过/v1/assistants/{assistant_id}/completions发送请求，必须通过**线程（Thread）**完成交互，正确流程如下：

正确交互流程 #

1. 创建一个新的线程（Thread）
2. 向该线程添加用户消息
3. 触发助手在该线程上运行
4. 轮询运行状态，直到完成后提取助手的响应消息

修正后的完整PHP代码 #

<?php
$api_key = '你的OpenAI API密钥'; // 替换为你的实际API密钥
$assistant_id = 'asst_abc'; // 替换为你的实际助手ID

// 步骤1：创建线程
$thread_url = 'https://api.openai.com/v1/threads';
$headers = [
    'Content-Type: application/json',
    'Authorization: Bearer ' . $api_key,
    'OpenAI-Beta: assistants=v1',
];

$ch = curl_init($thread_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([])); // 创建线程不需要额外参数

$thread_response = curl_exec($ch);
$thread_data = json_decode($thread_response, true);
curl_close($ch);

if (isset($thread_data['id'])) {
    $thread_id = $thread_data['id'];

    // 步骤2：向线程添加用户消息
    $message_url = 'https://api.openai.com/v1/threads/' . $thread_id . '/messages';
    $message_data = [
        'role' => 'user',
        'content' => 'Hello'
    ];

    $ch = curl_init($message_url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($message_data));

    $message_response = curl_exec($ch);
    curl_close($ch);

    // 步骤3：触发助手运行
    $run_url = 'https://api.openai.com/v1/threads/' . $thread_id . '/runs';
    $run_data = [
        'assistant_id' => $assistant_id
    ];

    $ch = curl_init($run_url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($run_data));

    $run_response = curl_exec($ch);
    $run_data = json_decode($run_response, true);
    curl_close($ch);

    if (isset($run_data['id'])) {
        $run_id = $run_data['id'];
        $run_status_url = 'https://api.openai.com/v1/threads/' . $thread_id . '/runs/' . $run_id;

        // 步骤4：轮询运行状态，直到完成
        do {
            $ch = curl_init($run_status_url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
            $status_response = curl_exec($ch);
            $status_data = json_decode($status_response, true);
            curl_close($ch);

            $status = $status_data['status'];
            if ($status === 'completed') {
                break;
            }
            sleep(1); // 等待1秒后再次查询
        } while (in_array($status, ['queued', 'in_progress']));

        // 获取线程中的所有消息，提取助手的响应
        $messages_url = 'https://api.openai.com/v1/threads/' . $thread_id . '/messages';
        $ch = curl_init($messages_url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        $messages_response = curl_exec($ch);
        $messages_data = json_decode($messages_response, true);
        curl_close($ch);

        // 输出助手的最新响应
        foreach ($messages_data['data'] as $message) {
            if ($message['role'] === 'assistant') {
                echo '助手响应：' . $message['content'][0]['text']['value'] . PHP_EOL;
                break; // 只取最新的助手响应
            }
        }
    } else {
        echo '创建运行失败：' . $run_response;
    }
} else {
    echo '创建线程失败：' . $thread_response;
}
?>

代码说明 #

• 替换代码中的你的OpenAI API密钥和asst_abc为实际值
• 助手运行是异步的，所以需要通过轮询状态来等待结果
• 最后从线程的消息列表中筛选出assistant角色的消息，即为助手的响应

内容的提问来源于stack exchange，提问作者vijay kumar