First of all I have to make a sleep() before I read data. Otherwise I don't receive any. It doesn't matter how long I sleep I allways get the same amount of data.

$ns = fsockopen("anyuri",80,$a,$a,$max);
$out="";
socket_set_blocking($ns,0);
fputs($ns,"GET / HTTP/1.1\r\nHost: anyuri\r\nConnection: close\r\n\r\n");
sleep(1);
while(!feof($ns)) $out.=strtolower(fread($ns,128));	

and how do I get the rest?

I tried to make another sleep and fread but there comes nothing. Even if I made socket_set_blocking($ns,1); and tried to read the rest I received nothing.

Everything works fine if I don't use socket_set_blocking($ns,0);

I tried it on some big sites and the maximum was about 25000 bytes!