fread() behaviour

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I'm trying to understand something about fread(). I'm using fread() on an incoming socket stream that will send, for example, 26630 characters:

while ( ($buf=fread($read[$i], 8192)) != '' ) {
	$sock_data .= $buf;
	usleep(1000);
	echo ".";
	}
echo ",";


As soon as the socket client sends the data, immediately the server will echo:

................................................................................................................................................

Then wait nearly a minute, and echo:

,

So my question is, why does fread wait if there is nothing more to read? Shouldn't it return immediately? (That's what I want.) And as for the delay, it's there so that if the incoming data is a little slow, it has time to catch up with fread. Thanks.

...Rene

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