[PHP] socket_read() hangs with FTP

[Serge]

Hello. I'm tried an example from PHP manual with simple TCP/IP Client. 
I'm create a socket to FTP server, then read data from socket
[PHP]
while ($out = socket_read($socket, 2048)) {
   echo $out;
}
[/PHP]
when all data are read, socket_read() don't return an empty string, it's 
hangs.
Can you tell me, how to write work with it? Thank you.
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