Description:
------------
When you trying to use FTP connections from different PHP scripts, the new created connection from one THREAD or FILE running - breaks another connection what was made from other THREAD or FILE. 

Reproduce code:
---------------
if ($pid = pcntl_fork())
{
  $my_pid = getmypid();
  print $pid." - ".$my_pid."\n";
  $a = ftp_connect("ftp.debian.com", 21, 5);
  echo $a;
  sleep(10);
}
else
{
  $my_pid = getmypid();
  $b = ftp_connect("ftp.kernel.org", 21, 5);
  echo $b;
  sleep(10);
}

Expected result:
----------------
This code will return Resource Id#4 for all threads. So if we will download or upload files with $b - connection ID it will be stopped when another thread will be started, with $a - connection ID. It happens when code started from different CLI FILES, or from FORKED processes of one source file.

Actual result:
--------------
Well I just wanted to have several FTP connections from one server - but seems it's impossible, because each new connection - breaks previous one what was made from other script.