No, though you will get a warning for it if they are in the same scope, to help keep you from doing it by accident. The new declaration will "hide" the old one until the end of its scope: 
my $test = 1;
my $test = 2;  # warns
{
    my $test = 3;
    print $test; # prints 3
}
print $test; # prints 2

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In reply to Re: Multiple 'my's in one block of mod_perl code? by ysth
in thread Multiple 'my's in one block of mod_perl code? by RedThree

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