Include a file from the root - php

Question

Here is the structure of my application :
core
application
controller_base.class.php
registry.class.php
router.class.php
template.class.php
controller
include
config.php
model
views
index.php
The file config.php is included in the index.php file (there's no problem with this) and here is what it contains :
<?php
/*** include the controller class ***/
include(ROOT . '/core/application/controller_base.class.php');
/*** include the registry class ***/
include(ROOT . '/core/application/registry.class.php');
/*** include the router class ***/
include(ROOT . '/core/application/router.class.php');
/*** include the template class ***/
include(ROOT . '/core/application/template.class.php');
/*** autoload model classes ***/
function __autoload($class_name) {
$filename = strtolower($class_name) . '.class.php';
$file = ROOT . '/core/model/' . $filename;
if (!file_exists($file)) {
return false;
}
// include the $class_name class
include($file);
}
$registry = new registry;
You have to know that the constant ROOT is defined like this :
define('ROOT', str_replace('/index.php', '', $_SERVER['SCRIPT_NAME']));
This constant contains the value /Lab/Livre/POO/TP1 which is of course the root of the applications.
But there's a problem whith all the files I include in config.php. PHP throws me an error that says the files are not found in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php.
So the problem is clear. I want PHP to look for the files from the root of the application (where index.php is), but it looks for it from the folder where config.php is located.
I had this problem for a long time but I want to find a solution once and for all.
I can't get it to do want I want ! I hope someone will help me.
Thank you very much.
P.S.: In other words, i want to include the files using an absolute path.
P.S.: Here is the full error text :
Warning: include(/Lab/Livre/POO/TP1/core/application/controller_base.class.php): failed to open stream: No such file or directory in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 4
Warning: include(): Failed opening '/Lab/Livre/POO/TP1/core/application/controller_base.class.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 4
Warning: include(/Lab/Livre/POO/TP1/core/application/registry.class.php): failed to open stream: No such file or directory in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 7
Warning: include(): Failed opening '/Lab/Livre/POO/TP1/core/application/registry.class.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 7
Warning: include(/Lab/Livre/POO/TP1/core/application/router.class.php): failed to open stream: No such file or directory in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 10
Warning: include(): Failed opening '/Lab/Livre/POO/TP1/core/application/router.class.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 10
Warning: include(/Lab/Livre/POO/TP1/core/application/template.class.php): failed to open stream: No such file or directory in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 13
Warning: include(): Failed opening '/Lab/Livre/POO/TP1/core/application/template.class.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /Users/tom/www/Lab/Livre/POO/TP1/core/include/config.php on line 13

Answer 1

I have found a solution to my problem. I set the ROOT constant to this :
define('ROOT', $_SERVER['DOCUMENT_ROOT'] . str_replace('/index.php', '', $_SERVER['SCRIPT_NAME']));
But what went wrong ?