Difference between `my`, `our`, and `local` in Perl

`my`, `our`, and `local` are all variable declaration keywords in Perl, but they differ in terms of scope and visibility.

`my`

The `my` keyword declares a lexical variable that is only accessible within the block in which it is declared. It has a narrow scope and is not visible outside the block.

`our`

The `our` keyword declares a package variable that is visible throughout the package in which it is declared. It has a wider scope compared to `my` and can be accessed from anywhere within the package.

`local`

The `local` keyword creates a temporary value for a global variable, which is restored when the current block or subroutine exits. It allows you to temporarily change the value of a global variable without affecting its value outside the current scope.

Understanding the differences between `my`, `our`, and `local` is crucial for managing variable scoping in Perl programs.