Re: [PHP] accessing variables within objects

Marten Lehmann wrote:
Hello,

I'm using some php-classes which worked fine with php-5.0.4. Now I tried to upgrade to php-5.2.6, but the classes give a lot of errors. If I set

error_reporting(E_ALL);

I see messages like

Notice: Undefined property: FastTemplate::$main in /whereever/inc.template.php on line 293

Notice: Undefined property: current_session::$cust_id in /whereever/inc.init.php on line 117

In inc.template.php there are a lot of calls like $this->$key. In inc.init.php there are calls like $session->cust_id.

to fix these errors, you would need to modify the code so it does something like this.

where it calls $this->$key you need to check and make sure that $key exists before you trying call for it.

So something like this would work.

if ( isset( $this->$key ) ) {
$this->$key;
} else {
$this->$key = null;
}

You didn't show any context in which you are using the above code. So I don't know what will actually work in your situation. Show a little more code that includes the method in which $this->$key is called.

You will want to look at using the Overloading feature of PHP5. Check out this page for overloading examples

http://us2.php.net/manual/en/language.oop5.overloading.php

Take note of the __get() and __set() methods. The __get method checks to see if the key exists before it tries working with it.


What has changed in php-5.2.x so that these calls don't work any more? What is the new, required form to use objects in a similar manner (unfortunately I have no ressources to code these classes from scratch)? Thanks.

Kind regards
Marten


--
Jim Lucas

"Some men are born to greatness, some achieve greatness,
and some have greatness thrust upon them."

Twelfth Night, Act II, Scene V
by William Shakespeare

.