[TYPO3-dev] Quick PHP question

[Oliver Salzburg]

Ah, that makes sense.
Thanks for clearing that up.

Regards
Oliver

On 2012-03-14 13:55, "Christian Müller (FLOW3 Team)" wrote:
> Sorry for the empty answer, hit the wrong key combination...
> 
> I think this sentence is a bit misleading, fact is that a class cannot
> extend from more than one other class. So you need a chain of extensions
> to do that. As you cannot know if other extensions want to extend the
> same class as you at some point in time the XCLASS configuration
> basically helps to build such an "extended class chain" without knowing
> all possible extensions.
> 
> Thats all, so no, a PHP class can be extended by many classes, but a
> class can only extend one other class at a time.
> 
> Cheers,
> Christian
> 
> On 14/03/12 13:43, Oliver Salzburg wrote:
>> I just read the following part in the TYPO3 core API documentation:
>>
>>> Hooks are the recommended way of extending TYPO3 compared to
>>> extending the PHP classes with a child class (see "XCLASS
>>> extensions"). It is so because only one extension of a PHP class can
>>> exist at a time while hooks may allow many different user-designed
>>> processing functions to occur.
>>
>> The statement "only one extension of a PHP class can exist at a time"
>> is really confusing me.
>> Was that true at some point in time or did I just skip some important
>> pages in my PHP lecture?