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Declaring variables once at the beginning of the code block where they are being first used is the best practice imo. One other alternative (yet poor) approach is to use the special $_ variable.
if ( $_ = $obj->get_id() ) { # use $_ inside this block... $obj->do_this(); } elsif ( $_ = $obj->create_id() ) { # use $_ inside this block $obj->do_that(); } else { $obj->do_somethingelse(); }
Generally, however, this wouldn't be a very sound approach, as it is usually very easy to loose track of the $_ variable. Although, it does spare you having to declare variables, especially for short code blocks or loops.

Update: As ikegami pointed out (++), I stress that the use of $_ is a bad idea. I just wanted to show one alternative, albeit a bad one as a means of warning against such approach. :)
"We've all heard that a million monkeys banging on a million typewriters will eventually reproduce
the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true." - Robert Wilensky, University of California

In reply to Re: scoping question by vladb
in thread scoping question by nmerriweather

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