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如何在PHP cURL中设置自定义headers?

大家好!我是PHP新手,正尝试通过cURL向外部API发送POST请求。API文档说需要传递几个自定义headers:`X-API-Key: mysecretkey`、`Content-Type: application/json`和`Authorization: Bearer token123`。我尝试将它们作为字符串传递给`curl_setopt($ch, CURLOPT_HTTPHEADER, ...)`,但不起作用——服务器返回400 Bad Request错误或忽略我的headers。 以下是我当前的代码: ```php $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "https://api.example.com/data"); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(["name" => "John"])); curl_setopt($ch, CURLOPT_HTTPHEADER, "X-API-Key: mysecretkey; Content-Type: application/json; Authorization: Bearer token123"); $response = curl_exec($ch); curl_close($ch); ``` 我将所有headers用分号连接成单个字符串传递。也许需要其他方式?另外:如何检查headers是否真的被发送了?