why this php global doesn't echo in Wordpress plugin -

i'm new php , i'm not sure why doesn't work. have done page said http://php.net/manual/en/language.variables.scope.php (example #1 using global)... why not working? it's frustrating.

this first attempt on wordpress plugins. first file contains:

function pp_sa_menu(){         add_menu_page('shadow accounts search', 'shadow accounts', 'manage_options', 'shadow_accounts', 'pp_sa_search'); } add_action('admin_menu','pp_sa_menu');  function pp_sa_search(){         include('shadow-accounts/admin/sa-admin.php'); } 

then sa-admin.php file problem happens

<?php $sandbox = true;  $phost = 'localhost'; $pus = 'user'; $ppas = 'pass';  $pus = 'hello world';  function testfunc(){     global $phost;     return $phost; }  echo testfunc(); //empty  function getforumaccounts(){     global $pus;     echo $pus; // empty     echo 'test'; // shows 'test'     echo $ppas; // empty  } getforumaccounts();  ?> 

not sure if work different but:

$phost = 'localhost';  function getforumaccounts(){   global $phost;   return $phost; }  echo getforumaccounts(); 

function should returning something. in case variable , can echo out or use function in way.