autoloading classes

1improved version : 
2<?php
3spl_autoload_register(function($className) {
4	$file = __DIR__ . '\\' . $className . '.php';
5	$file = str_replace('\\', DIRECTORY_SEPARATOR, $file);
6	if (file_exists($file)) {
7		include $file;
8	}
9});

1inside root directory create a autoloader.php file and add the following code :
2------------------------------------------------------------------------------
3<?php
4spl_autoload_register(function($className) {
5	$file = $className . '.php';
6	if (file_exists($file)) {
7		include $file;
8	}
9});
10
11inside your usage file : 
12--------------------------
13<?php
14include 'autoload.php';
15
16$circle = new Circle;
17$square = new Square;