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I do not hav experience with UDT, and now my brain is off

Really I thing that this is simple but however I need your help, please.

pagealias is "string-string-string"
gallery dir is "string_string_string"

I try to call page alias inside gallery tag as this:
{Gallery dir="$page_alias"}

It works, but...

But it fails when the alias have "-" and the created gallery dir have "_"

I think that I need an UDT that use this php function:

$alias2dir = str_replace('-', '_', $page_alias);

This is where my brain fails.
I do not understand how to complete my udt.

udt input: page_alias
udt output: alias string converted to dir string

My suggested UDT name is: alias2dir

Thanks in advance for all your help.

You don't need an UDT for that. Just use some Smarty magic: That should do the trick.

Thanks very much.