[Resolved] Gobal Object Space / persistent Objects in php? URGENT HELP DESIRED

jowestla

Hi all,
i am actually developing a quite small php application (one of my first projects in php) and i face a problem i am not able to solve by myself, due to lack of experience.

The problem i face is hopefully quite simple:

i want to be able to refer to a once created instance of a class in script X also out of script Y:

my effort
script :init_all.php (included everywhere):
<?
if(!$GLOBAL_SYSTEM_ENGINE)
{
$GLOBAL_SYSTEM_ENGINE=& new system_engine();
}
?>

script x.php:

<?php
require(init_all.php);

[...]
?>

script y.php:

<?php
require(init_all.php);

[...]
?>

everytime x or y are executed, a new instance of system_engine is created. Thats exactly what i try to avoid.

Is there any way to handle global - only once created - class istances in multiple scripts? Maybe though an superglobal object-container or whatever?

ps: I do not want to use $_SESSION to store objects, too complicated, static and performance-killing i fear.

thanks for any hint, especially also if i am riding the wrong horse.

jochen

ahundiak

It's not real easy to do what you want. You would be better off using sessions at least until you become comfortable in php. Don't worry too much about the performance. It's really not that bad of a hit.

It's possible for php to use shared memory. That means you can reserve a chunk of memory and have different php threads access it. That may save some of the overhead associated with your global_system_engine.

You can also write a little php server that starts up and never stops. Your scripts can then talk to this server via shared memory or maybe socket connections. And this again may save some overhead.

But, once again, it's best to start by using sessions and then shift over if you really need to.

jowestla

hi and thanks for your reply ...

i cannot imagine an appliction runtime environment where classes are only good for providing methods due to the fact that class data is lost permanently (due to reiinitialization).

maybe my question was wrong?

a small second example :

we have 2 php files called showme.php and changeme.php.

Class tell_me()
{
....
var $szName;

tell_me()
{
$this->szName=1;
}

function set_my_name($Name)
{
$szName=$Name;
}

function say_hello()
{
return("Hello, my name is ".$this->$Name;
}
}

file showme.php
<?php

refClas=WHAT HERE?

echo(refClass->say_hello());

header(Location: changeme.php);
exit();
?>

file changeme.php

<?php

refClas=WHAT HERE?

echo(refClass->set_name(random(10000000)));

header(Location: showme.php);
exit();
?>

in my experinces the result of showme will always be "1"

or am i wrong?

ahundiak

Too many syntax errors for me to figure out what your example is trying to do.

A key point of web programing is that it's stateless. Each script is processed completely independent of other scripts. So when showme.php runs, it has no idea if changeme.php has been run or vice versa.

So basically, each object does in fact have to be recreated from scratch for each script. But that's not hard to do and it works well in practice.

jowestla

Thanks a lot,
that answers my question

best regards,

jochen