fread blocking

[changsongl]

fread will just hang there forever until killed. fread is working in my local Windows environment. However, I have to remove freads to avoid blocking in my Unix product server. Anyone please tell me why it works in different ways? Also, what is the draw back to remove freads? It is so weird how it works. If I remove fread in my local environment, the socket server won't be able to get data that I sent. I am totally confused. Please help me. Thanks.

$handshaked = ($keyAccept === $expectedResonse) ? true : false;
if ($handshaked){
fwrite($fd, $this->hybi10Encode('42["' . $action . '", "' . addslashes($data) . '"]'));
fread($fd,1000000);
return true;
} else {return false;}