Autoloader.php

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<?php
 
namespace OAuth2;
 
class Autoloader
{
    private $dir;
 
    public function __construct($dir = null)
    {
        if (is_null($dir)) {
            $dir = dirname(__FILE__).'/..';
        }
        $this->dir = $dir;
    }
    public static function register($dir = null)
    {
        ini_set('unserialize_callback_func', 'spl_autoload_call');
        spl_autoload_register(array(new self($dir), 'autoload'));
    }
 
    public function autoload($class)
    {
        if (0 !== strpos($class, 'OAuth2')) {
            return;
        }
 
        if (file_exists($file = $this->dir.'/'.str_replace('\\', '/', $class).'.php')) {
            require $file;
        }
    }
}