for(;;){

fwrite(STDOUT, "n");
$name = fgets(STDIN);
fwrite(STDOUT, "Hello $name");

sleep(1);
}

for(;;){
    $read = array(STDIN);
    $write = NULL;
    $except = NULL;
    if(stream_select($read, $write, $except, 0, 200000) > 0) {
        if($read) {
            $name = fgets(STDIN);
            fwrite(STDOUT, "Hello $name");
        }
    } else {
        fwrite(STDOUT, "Waiting...n");
    }
}