PHP code to get user info from my database

[MozyMac]

but where should i put it and then what should i put in the template here is the code of the page:

<?php 

// ####################### SET PHP ENVIRONMENT ###########################
error_reporting(E_ALL & ~E_NOTICE); 

// #################### DEFINE IMPORTANT CONSTANTS #######################
define('NO_REGISTER_GLOBALS', 1); 
define('THIS_SCRIPT', 'imamac'); // change this depending on your filename 

// ################### PRE-CACHE TEMPLATES AND DATA ###################### 
// get special phrase groups 
$phrasegroups = array( 

); 

// get special data templates from the datastore 
$specialtemplates = array( 
     
); 

// pre-cache templates used by all actions 
$globaltemplates = array( 
    'imamac', 
); 

// pre-cache templates used by specific actions 
$actiontemplates = array( 

); 

// ######################### REQUIRE BACK-END ############################ 
require_once('./global.php'); 

// #######################################################################
// ######################## START MAIN SCRIPT ############################
// #######################################################################

$navbits = array(); 
$navbits[$parent] = 'Im a Mac'; 

$navbits = construct_navbits($navbits); 
eval('$navbar = "' . fetch_template('navbar') . '";'); 
eval('print_output("' . fetch_template('imamac') . '");'); 
$userinfo = fetch_userinfo($userid, 2);
$test123 = "test";
echo "$test123";

?>