Support php 5.2

config.php.example

 <?php
 
 return array(
+    'server'   => 'localhost',
     'database' => 'dibi',
     'table'    => 'links',
     'username' => 'root',

helper.php

@@ -6,7 +6,7 @@ function connect_db()
 {
     global $config;
 
-    $link = mysql_connect('localhost', $config['username'], $config['password']);
+    $link = mysql_connect($config['server'], $config['username'], $config['password']);
 
     if (!$link) {
         die('Could not connect: ' . mysql_error());

index.php

 <?php
 
+if( !defined( __DIR__ ) ) define( __DIR__, dirname(__FILE__) );
+
 define('PATH_BASE', __DIR__);
 
 require_once PATH_BASE . '/helper.php';

install.php

 <?php
 
+if( !defined( __DIR__ ) ) define( __DIR__, dirname(__FILE__) );
+
 if (!file_exists(__DIR__ . '/config.php')) {
     die("Copy `config.php.example` file to `config.php` file\n");
 }
@@ -7,7 +9,7 @@ if (!file_exists(__DIR__ . '/config.php')) {
 $config = require __DIR__ . '/config.php';
 
 $link = mysql_connect(
-    'localhost',
+    $config['server'],
     $config['username'],
     $config['password']
 );