curl_getinfo() may benefit from a table like curl_setopt()

Description

The following code works on:

root@32bf1ba2b92c:/app# php --version
PHP 8.0.8 (cli) (built: Jul 22 2021 02:36:54) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.8, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.8, Copyright (c), by Zend Technologies
root@32bf1ba2b92c:/app# curl
curl         curl-config  
root@32bf1ba2b92c:/app# curl --version
curl 7.64.0 (x86_64-pc-linux-gnu) libcurl/7.64.0 OpenSSL/1.1.1d zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.5) libssh2/1.8.0 nghttp2/1.36.0 librtmp/2.3
Release-Date: 2019-02-06
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL 

<?php
           $url = "https://google.fr";
            $ch = curl_init($url);

            curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
            curl_setopt($ch, CURLOPT_TIMEOUT, 120);
 $response = curl_getinfo($ch);
           echo $response["total_time_us"]

Resulted in this output:

the time in us

On another machine which has:

server :~/htdocs$ php -v
PHP 8.0.14 (cli) (built: Dec 16 2021 03:01:07) ( NTS gcc x86_64 )
Copyright (c) The PHP Group
Zend Engine v4.0.14, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.14, Copyright (c), by Zend Technologies
server :~/htdocs$ curl --version
curl 7.29.0 (x86_64-redhat-linux-gnu) libcurl/7.29.0 NSS/3.53.1 zlib/1.2.7 libidn/1.28 libssh2/1.8.0
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp 
Features: AsynchDNS GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz unix-sockets 

i got:

Warning: Undefined array key "total_time_us"  

Why ?

On the php.net documentation ,there is nothing about this total_time_us key.

PHP Version

PHP 8.0.14

Operating System

Centos 7

Start with the PHP documentation for curl_getinfo() and compare its documented result keys with the total_time_us key described in the issue. Document the key and the version or libcurl conditions affecting its availability, with the behavior shown on PHP 8.0 and the reported systems serving as the examples.