Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc.

If possible, make the script source available online and provide
an URL to it here. Try to avoid embedding huge scripts into the report.

Hm. I didn't suppose, that documentashion problem needs test case. Here is one:
<?php
$s = stream_socket_client('tcp://localhost:80', $errno, $error, 5);
stream_socket_sendto($s, "GET http://localhost/ HTTP/1.0\r\n");
stream_socket_sendto($s, "Host: localhost\r\n");
stream_socket_sendto($s, "\r\n");

echo "stream_get_line():\n";
var_dump(stream_get_line($s, 1500, "\r\n"));
echo "stream_socket_recvfrom():\n";
var_dump(stream_socket_recvfrom($s, 100));
echo "stream_get_contents():\n";
var_dump(stream_get_contents($s, 100));
?>

Output of it for my system is:
stream_get_line():
string(15) "HTTP/1.1 200 OK"
stream_socket_recvfrom():
bool(false)
stream_get_contents():
string(100) "Date: Sat, 03 Dec 2005 14:32:05 GMT
Server: Apache/2.0.54 (Win32) PHP/5.1.0RC5-dev
Content-Length:"

As you can see stream_socket_recvfrom() returns false the same as when "end of socket" is reached. And it is reached. All incoming data from socket is stored in stream buffer, call to stream_get_contents() proves that.

Well, the recvfrom() function is supposed to be used with connection-less sockets (such as UDP), not TCP.
Anyway PHP is smart enough to call recv when needed. But it will read the data directly from the socket and not from the usual stream buffer (checked with Wez & source code).
This should be documented, of course.

Well, but example in current documentation use tcp :).
That's how I understand that it is bypass stream buffer - look to sources, and about documenting this behaviour was my bug report.

This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.

Thank you for the report, and for helping us make our documentation better.

"Calls to stream_socket_recvfrom() on socket-based streams, after calls to buffer-based stream functions (like fread() or steam_get_line()) read data directly from the socket and bypass the stream buffer."