[PHP] Socket Server problem

[René Fournier]

I'm working through Ori Staub's excellent Socket Server tutorial 
(http://www.zend.com/zend/tut/tutorial-staub3.php), but can't get the 
sample server working. I've read the user comments and fixed a couple 
things, but still, no dice. Here's the error I receive:

[Valhalla:~/Sites/test] rene% /usr/local/php/bin/php s9.php
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30
PHP Notice:  Undefined variable:  client in 
/Users/rene/Sites/test/s9.php on line 30

...and then it just hangs. Since I'm so new to sockets, and probably 
don't yet grasp the concepts perfectly, I'm a little lost where to 
start. Any ideas?

Here's my code:

<?

// VARIABLES
set_time_limit(0);
$server_ip = "192.168.0.200";
$server_port = "7000";
$max_clients = 10;
// Array will hold client info
$clients = Array();
// Create TCP stream socket
$sock = socket_create(AF_INET,SOCK_STREAM,0);
// Bind the socket
socket_bind($sock,$server_ip,$server_port) or die('Could not bind to 
address');

// Start listening...
socket_listen($sock);
// Loop
while (true)
{
        // Setup clients listen socket for reading
        $read[0] = $sock;
        for ($i = 0; $i < $max_clients; $i++)
        {
                if ($client[$i]['sock'] != null) $read[$i+1] = $client[$i]['sock'];
        }
        // Set up a blocking call to socket_select()
        $ready = socket_select($read,$null=null,$null=null,$null=null);
        
        
        // If a new connection is being made add it to the client array
        if (in_array($sock,$read))
        {
                $cur_conn = count($client);
                for ($i = 0; $i < $cur_conn; $i++)
                {
                        if ($client[$i]['sock'] == null)
                        {
                                $client[$i]['sock'] = socket_accept($sock);
                                break;
                        } elseif ($i == $max_clients - 1)
                                print ("too many clients");
                }
                if (--$ready <= 0)
                        continue;
        } // end if in_array
                
                
        
        // If a client is trying to write, deal with it
        $cur_conn = count($client);
        for ($i = 0; $i < $cur_conn; $i++) // for each client
        {
                if (in_array($client[$i]['sock'],$read))
                {
                        $input = socket_read($client[$i]['sock'],1024);
                        if ($input == null) { // Zero length string meaning 
disconnected
                                unset($client[$i]);
                                }       
                        if ($input == 'exit') { // requested disconnect
                                socket_close($client[$i]['sock']);
                                } elseif ($input) { // strip whitespace and writeback 
to user
                                        $output = ereg_replace("[ 
\t\n\r]","",$input).chr(0);
                                        $socket_write($client[$i]['sock'],$output);
                                }
                } else {
                        // Close the socket
                        socket_close($client[$i]['sock']);
                        unset($client[$i]);
                }
        }
} // end while
                        
// Close the master sockets
socket_close($sock);
                        
?>
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