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What's the difference between deep and shallow binding?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:27 UTC ( #696=perlfaq nodetype: print w/replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

In deep binding, lexical variables mentioned in anonymous subroutines are the same ones that were in scope when the subroutine was created. In shallow binding, they are whichever variables with the same names happen to be in scope when the subroutine is called. Perl always uses deep binding of lexical variables (i.e., those created with my()). However, dynamic variables (aka global, local, or package variables) are effectively shallowly bound. Consider this just one more reason not to use them.

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[marto]: so I have to work Saturday, which is good and bad. Bad in the sense that I have to be hear early :( Good in that I am here only as support for another client project, so I get to spend the day working on my personal 'ToDo' list, without the kids :P
[Corion]: marto: Ooof - but yes, being there as only second level support or third level support is good and if you have enough things that you can work on, it won't be a wasted (if paid) day

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