[TYPO3-dev] Extending classes on demand

[Johannes Reichardt]

Hi Franz,

thanx for the answer. Somehow classes in php still really confuse me and 
i am far away from really understanding i think.
So the "normal" class that is used in typo3 is instantiated already by 
typo3 while execution? that is why $this works? is $this right? :)

the problem i have is that the scope is always changing and i do not see 
a convinient way to "inline-extend" a class without problems. it would 
be just very comfortable to have constructs like this:

class foo {
require_once('class.extends_foo.php');
}

// other php file
extends( {
.../blaaa
}

and in both of them you can access everything like it was one - only 
that you load the extends stuff on demand. but i guess i am thinking in 
the wrong direction, on the other hand i do not understand why this 
won´t work. i would get rid of scope and variable problems quickly... 
hrmpf ;)

I am currently trying to understand this interesting seeming article 
about "flexible objects" - maybe that will bring me further ;)
http://www-128.ibm.com/developerworks/opensource/library/os-php-flexobj/

- Johannes

> Johannes Reichardt a écrit :
>   
>> Hi there,
>>
>> i have a few questions regarding php, classes, extending and that 
>> related to typo3 also.
>>
>> Right now i struggle with a construction like this:
>>
>> class tx_xy {
>>    function foo() {
>>        require_once('class.tx_xy_extended.php');
>>        return $this->foo_extended();
>>    }
>> }
>> in seperate file:
>>
>> class tx_xy_extended extends tx_xy {
>>    function foo_extended() {
>>       return 'damn oop shit';
>>    }
>> }
>>
>> echo tx_xy::foo();
>>
>> this does not work for many reasons - the most annyoing problem is the 
>> problem that the $this-> thing doesnt work as expected.
>>     
>
>
> This will never work with $this because you did not instantiate any object.
>
>   
>> tx_xy::foo();
>>     
>
> return tx_xy_extended::foo_extended();
>
>
> or with objects:
>
> $obj = t3lib_div::makeInstance('tx_xy');
> echo $obj->foo();
>
>
>   class tx_xy {
>      function foo() {
>          require_once('class.tx_xy_extended.php');
> 	$obj = &t3lib_div::getUserObj('tx_xy_extended');
>          return $obj->foo_extended();
>      }
>
>   }
>
>
>
> - Franz
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