Curl从php脚本获取数据而不在该脚本上显示它

I have two php scripts on two different servers. I'm using curl to get data from one to the other (from server 1 to server 2):

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec($ch);

curl_close($ch);

It works but is there a way to hide the output on server 1 if somebody is accessing that script through its actual url?

A very basic way to lock down your PHP script is to create a password via a URL parameter. What if you had ?pwd=ABCDEF (create your own password here https://passwordsgenerator.net/) and then your Server-side PHP script can check to see if the password matches the URL parameter, and if it does you can print out the output. Then modify PHP script #2 to pass your chosen password as a URL Parameter

May be you can use cookies.
Send a private cookie with curl and check on server 1 for that cookie and cookie value.
If that's not the right cookie, show error or set header to 404