PHP Use Variable defined in header.php within another file - php

Question

I am trying to use a geoplugin (that code works) but I may wish to use the output in multiple locations. Because of this I've taken the code and added it to the header.php file and called the variable within my theme/inc/partials/header-contact.php. But the value is not displaying:
header-contact.php
<div class="head-contact">
<?php $details = get_field('options_company_details', 'options');
global $telephoneNumber; global $telephoneLink;?>
<span class="phone"><span class="phone-mob"><i class="fa fa-phone"></i></span><span class="tnumber"></span><?php echo $telephoneNumber;?></span>
<p class="tagline"><?php echo $details['options_tagline'];?></p>
</div>
header.php
<?php include_once(get_stylesheet_directory_uri().'/inc/geolocation.php');?>
var_dump in header-contact.php
NULL
var_dump in header.php
NULL
geolocation.php
function getUserIP() {
$client = #$_SERVER['HTTP_CLIENT_IP'];
$forward = #$_SERVER['HTTP_X_FORWARDED_FOR'];
$remote = $_SERVER['REMOTE_ADDR'];
if(filter_var($client, FILTER_VALIDATE_IP)){$ip = $client;}
elseif(filter_var($forward, FILTER_VALIDATE_IP)){$ip = $forward; }
else { $ip = $remote; } return $ip;
} $user_ip = getUserIP();
$details = get_field('options_company_details', 'options');
$telephoneNumber = $details['options_telephone'];
$getGeoArray = unserialize(file_get_contents('http://www.geoplugin.net/php.gp?ip='.$user_ip.''));
if(in_array($getGeoArray['geoplugin_city'], $lincolnshire)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $rutland)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $northamptonshire)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $norfolk)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $cambridgeshire)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $buckinghamshire)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $bedfordshire)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $hertfordshire)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $essex)){$telephoneNumber = 'NUMBER';}
elseif(in_array($getGeoArray['geoplugin_city'], $leicestershire)){$telephoneNumber = $details['options_telephone'];}
$telephoneLink = str_replace(' ', '', $telephoneNumber);
I've removed the variables used in the in_array() just to save question length.
var_dump in geolaction.php
NUMBER

Answer 1

I ended up using $_SESSION[] not quite sure if this is the best way to do this but it works so I am happy:
$_SESSION['phonenumber'] = $telephoneNumber;
$_SESSION['phonenumberLink'] = $telephoneLink;
echo $_SESSION['phonenumber'];
echo $_SESSION['phonenumberLink'];

Answer 2

This is untested but this may work if called with wp_head or init. This might make the global keyword work in the template parts.
// functions.php
// load at wp_head
add_action('wp_head', function() {
include_once(get_stylesheet_directory_uri().'/inc/geolocation.php');
});
// or
add_action('init', function() {
include_once(get_stylesheet_directory_uri().'/inc/geolocation.php');
});
Then you don't need to include it in your header file or have to use sessions.