您需要将选项 CURLOPT_PROXYTYPE 设置为 CURLPROXY_SOCKS5_HOSTNAME，遗憾的是 在旧的 PHP 版本中没有定义，大约在 5.6 之前；如果你之前有但你可以明确地使用它的值，它等于 7:

You need to set option CURLOPT_PROXYTYPE to CURLPROXY_SOCKS5_HOSTNAME, which sadly wasn't defined in old PHP versions, circa pre-5.6; if you have earlier in but you can explicitly use its value, which is equal to 7:

curl_setopt($ch, CURLOPT_PROXYTYPE, 7);