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$[

...
Note that, unlike other compile-time directives (such as strict), assi
+gnment to 
$[ can be seen from outer lexical scopes in the same file. However, yo
+u can use 
local() on it to strictly bind its value to a lexical block.

perl -le '@arr=qw(10 1 2 3 4);$[=1;print $arr[$_],"\t",$_ for 0 .. $#a
+rr;'
10    0
10    1
...
2    3
3    4
4    5