On Wed, 2007-04-25 at 22:15 +0800, Man-wai Chang wrote:
> Buesching, Logan J wrote:
> > Heh, lucky me I was just looking into that earlier today.
> > http://us.php.net/manual/en/language.types.string.php
> > Around the "Simple Syntax" area.
> 
> Thanks. Foxpro called this macro substitution.

Only if used as a variable interpolation delimiter within heredoc or a
double quoted string. You didn't originally mention a string context, in
which case it's for accessing variables with dynamic names.

Cheers,
Rob.
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