Description:
------------
Curl allows to give some extra information about the ssl/tls connection time with CURLINFO_APPCONNECT_TIME. This info is not returned yet when curl_getinfo is called without any options.

Here you can find the registered global
https://github.com/php/php-src/blob/e015faaf8f022f6338c0254ef2fd617f29c94c84/ext/curl/interface.c#L1069

and i am guessing it should be implemented in this block
https://github.com/php/php-src/blob/e015faaf8f022f6338c0254ef2fd617f29c94c84/ext/curl/interface.c#L3020

Test script:
---------------
<?php

$ch = curl_init('http://www.yahoo.com/');


curl_exec($ch);

if(!curl_errno($ch)){
    $info = curl_getinfo($ch);
}

curl_close($ch);

Expected result:
----------------
An array with the "appconnect_time" key and its value

Actual result:
--------------
The only way now is to get the value with 
<?php
curl_getinfo($ch,CURLINFO_APPCONNECT_TIME);
?>

which is not even documented.