PHP Include based on Array value

I have multiple php files named as following:

• footer-01.php


• footer-02.php


• footer-03.php

and I have this array

<?php
    $footer = array(
    1 => "01" // Choose Between 01 to 03
    );
?>

I would like to use the value on this array to build up a php include file like the one showing below. the basic idea here is that based on the reference value on this array, a different include syntax would be build.

This is what I came up with but php are showing errors:

<?php
    foreach($footer as $key => $item)
    {
    if ($key <> '')
    include '../includes/footer-' . $footer[$key] . '.php';
    }
?>

Any ideas on how that can be done? Thanks for help ...