'daisy chain' includes - doesn't work?

I'm not sure how I've never come across this before, but here goes.

I have index.php which has:

include('backend.php')

PHP:

I have backend.php which has

include('config.php')

PHP:

Now, when I define a variable in config.php, I can use it in backend.php. When I define a variable in backend.php, I can use it index.php. Why then, when I define a variable in config.php - can I not use it in index.php?

 

You may need to define the variables in the config.php file as global in order for them to pass up the chain.

In the manual for include(), the php developers state -- somewhat unhelpfully:

Perhaps, more helpfully, when the phpers talk about scope they add:

I know this is not quite an answer, But, I hope it helps.

 

The variables should be global across includes by default. I do multi-level includes like that and it isn't a problem. Are you maybe resetting the variable somewhere?

 

Interesting. It seems to work fine on my *nix boxes, but the wamp stack I use for testing just doesn't like it.

Is it a php.ini setting perhaps?

 

Ahh no comment on WAMP Uncharted waters for me.