如何使用PHP cURL发布JSON数据

<?
$data = array(
    &#39;username&#39; => &#39;tecadmin&#39;,
    &#39;password&#39; => &#39;012345678&#39;
);
 
$payload = json_encode($data);
 
$ch = curl_init(&#39;https://api.example.com/api/1.0/user/login&#39;);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
 
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    &#39;Content-Type: application/json&#39;,
    &#39;Content-Length: &#39; . strlen($payload))
);

$result = curl_exec($ch);

curl_close($ch);