Description:
------------
fwrite refuses to write more then 32k to non-blocking socket.
removing the stream_set_blocking line in my sample code will make the program work properly.

It seems to get higher amount written on a localhost socket, about 120kb.

Reproduce code:
---------------
#!/usr/local/bin/php -q
<?php

// create a string with 100kb of zeros
$bytes = "";
for ($i = 0; $i < 100000; $i++){
$bytes .= "0";
}

$sock = @stream_socket_client('tcp://google.com:80', $errno, $errstr, 30);

stream_set_blocking($sock, 0);

$written = fwrite($sock, $bytes);

echo "Wrote $written bytes\n";
fclose($sock);
?>

Expected result:
----------------
Wrote 100000 bytes

Actual result:
--------------
Wrote 32768 bytes