[PHP] Socket server with multiple connections

[René Fournier]

I've gone through a few good socket client and server tutorials (such 
as http://www.devshed.com/c/a/PHP/Socket-Programming-With-PHP/), and 
have got the samples working. What I'm trying to do now is write a 
simple Socket Server that will accept multiple connections, do its 
thing, and keep running.

This Zend tutorial (http://www.zend.com/zend/tut/tutorial-staub3.php) 
does explain the concepts pretty well, but I cannot for the life of me 
get the sample code to run. The user comments noticed a couple typos, 
and other errors, which I've fixed, but still... no dice. I'm running 
PHP Version 4.3.4 on Mac OSX 10.2.8. Here's the error message:

------------------
[Valhalla:~/Sites/sockets/test] rene% /usr/local/php/bin/php s9.php
PHP Notice:  Undefined offset:  0 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  0 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  1 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  1 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  2 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  2 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  3 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  3 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  4 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  4 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  5 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  5 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  6 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  6 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  7 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  7 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  8 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  8 in /Users/me/Sites/sockets/test/s9.php on 
line 20
PHP Notice:  Undefined offset:  9 in 
/Users/me/Sites/sockets/test/s9.php on line 20

Notice: Undefined offset:  9 in /Users/me/Sites/sockets/test/s9.php on 
line 20
------------------
Here my code:
------------------
<?

// VARIABLES
set_time_limit(0);
$server_ip = "192.168.0.200";
$server_port = date("i")."000";


// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not 
create
socket\n");

// bind socket to port
$result = socket_bind($socket, $server_ip, $server_port) or die("Could 
not bind to
socket\n");

// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket
listener\n");
echo "Waiting for connections...\n";

// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming
connection\n");
echo "Received connection request\n";

// write a welcome message to the client
$welcome = "Welcome to the Server!\n ".chr(0);
socket_write($spawn, $welcome, strlen ($welcome)) or die("Could not send
connect string\n");
// keep looping and looking for client input
do
{
        // read client input
        $input = socket_read($spawn, 1024) or die("Could not read 
input\n");

        if (trim($input) != "")
        {
  echo "Received input: $input\n";
                
                  // if client requests session end
                  if (trim($input) == "END")
                  {
                                // close the child socket
                                // break out of loop
                                socket_close($spawn);
                                break;
                  }
                  // otherwise...
                  else
                  {
                                // reverse client input and send back
                                $output = strtoupper($input);
                                socket_write($spawn, $output) or die("Could
                not write output\n");
                                echo "Sent output: " . trim($output) . "\n";
                  }
        }
} while (true);

// close primary socket
socket_close($socket);
echo "Socket terminated\n";
                        
?>
-----------------------
Any ideas?

...Rene

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