Description:
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No matter give fe80::a00:27ff:fe3d:af20 or fe80::a00:27ff:fe3d:af20%eth0 as the address, the socket_connect will just fail.
From strace and the PHP source code, what I found is the sin6_scope_id always equals to 0, while with telnet when passed in fe80::a00:27ff:fe3d:af20%eth0, from strace, we got sin6_scope_id=if_nametoindex("eth0"). So the socket_connect code needs be changed for proper IPv6 support.

Test script:
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#!/usr/bin/php
<?php
  $sock=socket_create(AF_INET6, SOCK_STREAM, 0);
  if(socket_connect($sock, $argv[1], $argv[2]))
    echo "Connected to ".$argv[1]." port ".$argv[2];
?>

Expected result:
----------------
If you run the script with
  ./phpscript 2606:4100:3880:1250::100 80
You should see "Connected to 2606:4100:3880:1250::100 port 80"

Actual result:
--------------
PHP Warning:  socket_connect(): unable to connect [22]: Invalid argument in phpscript on line 4.