Replace '__autoload' (deprecated in PHP 7.2) with 'spl_autoload_register'.

http://php.net/manual/en/function.autoload.php
http://php.net/spl_autoload_register
https://wiki.php.net/rfc/deprecations_php_7_2

include/autoload.php

@@ -1,7 +1,7 @@
 <?php
 	require_once "functions.php";
 
-	function __autoload($class) {
+	spl_autoload_register(function($class) {
 		$class_file = str_replace("_", "/", strtolower(basename($class)));
 
 		$file = dirname(__FILE__)."/../classes/$class_file.php";
@@ -10,4 +10,4 @@
 			require $file;
 		}
 
-	}
+	});