It depends on how you have set-up your arrays. If they are like this:
index   @ar_1   @ar2
0       John    London
1       Mike    Paris
2       Vivien  Milan
3       John    Berlin
4       Vivien  Paris
etc...

[download]
Then you would like to end up with a Hash of Array structure as follows: 
John   => [London, Berlin],
Mike   => [Paris],
Vivien => [Milan, Paris]

[download]
Which you can do as follows: 
use strict;
use Data::Dump qw/dump/;

my @ar_1 = qw/John Mike Vivien John Vivien/;
my @ar_2 = qw/London Paris Milan Berlin Paris/;

my %hash;

foreach (0 .. $#ar_1) {
    push @{$hash{$ar_1[$_]}}, $ar_2[$_];
}

print dump(\%hash);

[download]

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re: Mutiple values for a single ke in hashes by CountZero
in thread Mutiple values for a single ke in hashes by taj

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.