PHP crashing my webpage for unknown reason - php

Question

For some reason, PHP crashes when I try to open a page. I am using localhost:82 in Uniform Server Zero.
The code is as follows:
index.php
<?php
require_once 'core/init.php';
$db = new DB();
?>
core/init.php
<?php
session_start();
$GLOBALS['config'] = array(
'mysql' => array(
'host' => 'localhost:82',
'username' => 'root',
'password' => 'password',
'db' => 'forum'
),
'remember' => array(
'coolie_name' => 'hash',
'cookie_expiry' => 604800
),
'session' => array(
'session_name' => 'user'
)
);
spl_autoload_register(function($class) {
require_once '../classes/' . $class . '.php';
});
require_once '../functions/sanitize.php';
?>
functions/sanitize.php
<?php
function escape($string) {
return htmlentities($string, ENT_QUOTES, 'UTF-8');
}
?>
I tried adding the text test before and after each of the php tags, and it seems that only index.php crashes (It displays the test text before the php tags, but not after - even in View Source mode).
The browser I am using is the Aurora dev version, and I am getting the code from this youtube tutorial.