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xiffy
Nucleus Guru

Joined: 27 Mar 2002
Posts: 1218
Location: Deventer

Posted: Mon Sep 25, 2006 11:18 pm Post subject: Backreferntial object not working in some php versions

I'm using PHP5 on my box and don't have a need for a PHP4 test environment. But this lazyness has off course backfired when developing plugins. In the plugin I instantiate a class like this:

Code:

class NP_Plugin {
function NP_Plugin() {
$lib = new LIB($this);
}
}

class LIB {
function LIB($parent) {
$sqllib = new SQLLIB($parent);
}
}

class SQLLIB {
function SQLLIB($plugin) {
$this->plugin = $plugin;
}
function somefunction() {
$value = $this->plugin->getOption('someoption');
}
}

The problem is of course $value = $this->plugin->getOption('someoption'); in the somefunction inside SQLLIB.
It does not work on some (older?) PHP installs. No error, but no value either
Does anyone know how I can get a plugin option from some distant CLASS that works on all php versions?

cheers
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pepiino
Nucleus Disciple

Joined: 26 Feb 2005
Posts: 100
Location: Czech Republic

Posted: Tue Sep 26, 2006 9:08 pm Post subject: Re: Backreferntial object not working in some php versions

xiffy wrote:

It does not work on some (older?) PHP installs. No error, but no value either
Does anyone know how I can get a plugin option from some distant CLASS that works on all php versions?

It's a problem of PHP4 and object copying. I'v just sent you a bugreport about NP_SpamBayes and php4 (see http://forum.nucleuscms.org/viewtopic.php?p=67138#67138). It's the same problem you are mentioning here and I included my explanation and solution in the post.

In your example it should be:

Code:

class NP_Plugin {
function NP_Plugin() {
$lib = new LIB($this);
}
}

class LIB {
function LIB(&$parent) { // <====reference operator should be here
$sqllib = new SQLLIB($parent);
}
}

class SQLLIB {
function SQLLIB(&$plugin) { // <====and here
$this->plugin = &$plugin; // <====and here
}
function somefunction() {
$value = $this->plugin->getOption('someoption');
}
}

Welcome to the PHP4 reference hell Sad

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xiffy
Nucleus Guru

Joined: 27 Mar 2002
Posts: 1218
Location: Deventer

Posted: Tue Sep 26, 2006 9:51 pm Post subject:

Okay, that's what I needed.
And yes you guessed right on the other topic Wink

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http://xiffy.nl/weblog/
Japan photo's: http://2006.cooljapan.nl/main.php?g2_itemId=20

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