ZEND PHP 5 Certification STUDY GUIDE

Streams and Network Programming ” 249
cols—when you need to take matters into your own hands. Luckily, the stream layer
makes even this much easier to handle than, say, if you were using C. In fact, you can
create socket servers and clients using the stream functions stream_socket_server()
and stream_socket_client(), and then use the traditional file functions to exchange
information:
$socket = stream_socket_server("tcp://0.0.0.0:1037");
while ($conn = stream_socket_accept($socket)) {
fwrite($conn, "Hello World\n");
fclose($conn);
}
fclose($socket);
We can then connect to this simple “Hello World” server using
stream_socket_client().
$socket = stream_socket_client(’tcp://0.0.0.0:1037’);
while (!feof($socket)) {
echo fread($socket, 100);
}
fclose($socket);
Finally, we can run our server just like any other PHP script:
$ php ./server.php &
and our client:
$ php ./client.php
Hello World
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)
Stream Filters
Stream filters allow you to pass data in and out of a stream through a series of filters
that can alter it dynamically, for example changing it to uppercase, passing it
through a ROT-13 encoder, or compressing it using bzip2. Filters on a given stream