Sams Teach Yourself Perl in 21 Days, Second Edition

Q&A

Q1:	How is declaring global variables with my any advantage over using regular global variables if I'm writing self-contained scripts to do very simple things?
A1:	If the only scripts you write are smaller, self-contained scripts, then you don't really need to use use strict or make sure your variables are declared using my. You'd use my globals if there was a chance for your code being incorporated into someone else's code, even accidentally. Because quite a lot of code has a chance of being used in ways contrary to how you intended it to be used, the use of my globals and use strict is considered a defensive move and good-programming practice. But it is not required.
Q2:	Most languages use either lexical or dynamic scope, but not both. Why ...