... the global you want to create ...

But be aware that  my @globalarray; still declares a lexical variable: it is not visible to any code prior to the point of declaration, and it is not visible in any other source file in the application. If a lexical is declared very early in a source file (update: and if it's not declared in a block scope of any kind, i.e., if it's "in file scope") and if there is only one source file in the application, then a lexical can give a pretty darn good imitation of a global, but it's still a lexical.