Perl - Global variables available in all included scripts and modules? -

so lets have main.pl script , in script need declare variables (any kind of variable constant or normal) , variables need available through scripts , modules i'll include main.pl script automatically.

what mean if have variable $myvar in main.pl , main.pl require script1.pl, script2.pl or script3.pm, , of scripts need access $myvar access var defined in specific script or module.

i've searched on net, i've found examples can access variables scripts include or extract variables modules; that's not want.

isn't there keyword in php use global $var1, $var2 etc. use variable parent script?

any example, documentation or article acceptable - me accomplish helpful.

you can declare global variables our keyword:

our $var = 42; 

each global variable has qualified name can used access anywhere. full name package name plus variable name. if haven't yet declared package @ point, in package main, can shortened leading ::. above variable has names

$var       # inside package main $main::var # obvious $::var     # may compromise 

if had used package, prefix change, e.g.

package foo; our $bar = "baz"; # $foo::bar anywhere, # or $::foo::bar or $main::foo::bar 

if want use variable without prefix, under other packages, have export it. done subclassing exporter, see @davids answer. however, can provide variables packages being used, not other way round. e.g.

foo.pm:

package foo; use strict; use warnings; use parent 'exporter'; # imports , subclasses exporter  our $var = 42; our $not_exported = "don't @ me";  our @export = qw($var); # put stuff here want export # put vars @export_ok exported on request  1; 

script.pl:

#!/usr/bin/perl # implicitly package main use foo; # imports $var  print "var = $var\n"; # access variable without prefix print "$foo::not_exported\n"; # access non-exported var full name 

lexical variables (declared my) don't have globally unique names , can't accessed outside static scope. can't used exporter.