In case you are curious:

index.php sets up a basic screen and initiates a websocket connection.

As each new incoming websocket client connection is made, a new listening socket is created
for that client and a 
corresponding new instance of php started using php's 'proc_open()' (Execute a command and open
file pointers for 
input/output).

         $this->proc = proc_open($cmd, $procDescriptor, $pipes, $cwd, $env);

where $cmd is essentially

         php sshost.php addr port clNum

sshost.php creates a socket connection at the indicated port and starts the app.

----------+------+---------+------+------------------------+--------+----------+
http      | port | browser | port |       websocket        | port   |   app    |
server    | 80   |         | 8001 |        server          | 8002+N | instance |
           |      |         |      +--------+------+--------+        |          |
           |      |         |      |   ws   | port |  app   |        |          |
           |      |         |      | client | N/A  | client |        |          |
----------+------+---------+------+--------+------+--------+--------+----------+
           | ==>  |  1      | <==> |   1    | <==> |   1    |  <==>  |
  1      |
index.php | ==>  |  2      | <==> |   2    | <==> |   2    |  <==>  | 
 2      |
px.js     |      | ...     |      |  ...   |      |  ...   |        |  ...     |
           | ==>  |  N      | <==> |   N    | <==> |   N    |  <==>  |
  N      |
----------+------+---------+------+--------+------+--------+--------+----------+

Tha app's I/O is through its port.

px.js javascript handles browser I/O and websocket comms.

- Bernie

On 14/9/18 6:18 am, Larry DiGiovanni wrote:
> Bernie van't Hof wrote:
> 
>> First things first. Dynamic typing is quite common in scripting languages and makes
them infinitely easier to use than 
>> many strongly typed languages.
> 
> Yes, I was referring to both at once (scope and type), particularly when a large application
is in play.  PAL could've 
> improved things with some sort of OPTION EXPLICIT... thing.
> 
>> As each new client (tab or user) makes a connection to the websocket server it is routed
to a completely new instance 
>> of php to talk to and the app instantiated in that instance. So they are completely
separate. The talk between the 
>> websocket server and each instance of php is via separate socket connection. Its fast.
Globals are unique to each 
>> instance of php.
> 
> This was the answer to my question.  I really have two barriers to diving in deeper to
your code.  One is I don't have 
> time.  Two is I don't know PHP, and lack the time to become familiar enough with it (See
One).
> 
> -- 
> Larry DiGiovanni