Miscellany

//database.php
<?php
	function getDatabase() {
   		$db = new mysqli('localhost', 'root', '', 'beerthirty');
   		if(!$db) {
   			return false;	
   		}
   		return $db;
   	}
 ?>

//index.php
<?php 
	include_once("agent.php"); 
	include_once("constants.php");
	include_once("database.php");
?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
    <title>a yet to be named application</title>
    
    <?php 
        $agent->init(); 
        
        $db = getDatabase();
        
        $getCities = "select * from cities";
        $cities = $db->query($getCities);  
        
        function getCityInformation($cityId) {
            $db = getDatabase();