#! /usr/bin/perl -l                                                           
use strict;                                                                   
use warnings;                                                                 
                                                                              
our @array = ( 1 .. 5 );                                                      
                                                                              
sub foo {                                                                     
    our @array;                                                               
                                                                              
    print "  inside before modification: @array";                             
                                                                              
    # work with @array and modify it                                          
    @array = ( 'a' .. 'e' );                                                  
                                                                              
    print "  inside after modification: @array";                              
}                                                                             
                                                                              
# now do the work                                                             
print "outside before calling foo(): @array";                                 
foo();                                                                        
print "outside after calling foo(): @array";