mod_substitute f flag

[Rich Bowen <rb...@rcbowen.com>]

The docs for mod_substitute say:

f
     The f flag causes mod_substitute to flatten the result of a  
substitution allowing for later substitutions to take place on the  
boundary of this one.

Can someone tell me what that means? Perhaps give an example of when  
I might want to use it? I'm unable to figure out what "flatten" means  
in this context. Is there a case when something will break if I don't  
use f?

Thanks.

--
Just because your voice reaches halfway around the world doesn't mean  
you are wiser than when it reached only to the end of the bar.
Edward R. Murrow

Re: mod_substitute f flag

[Rich Bowen <rb...@rcbowen.com>]

On Feb 11, 2008, at 09:46, Rich Bowen wrote:

> The docs for mod_substitute say:
>
> f
>     The f flag causes mod_substitute to flatten the result of a  
> substitution allowing for later substitutions to take place on the  
> boundary of this one.
>
> Can someone tell me what that means? Perhaps give an example of  
> when I might want to use it? I'm unable to figure out what  
> "flatten" means in this context. Is there a case when something  
> will break if I don't use f?

I've just been informed that there was some discussion of this on  
dev@. I'll try to read that thread and see if it helps. I'd really  
like something less cryptic in the docs, so that folks know when to  
use f, and don't just throw it on just to see if it helps.

--
"She had a pretty gift for quotation, which is a serviceable  
substitute for wit."
W. Somerset Maugham