Autoloader.php

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<?php
PHPExcel_Autoloader::Register();
//    As we always try to run the autoloader before anything else, we can use it to do a few
//        simple checks and initialisations
//PHPExcel_Shared_ZipStreamWrapper::register();
// check mbstring.func_overload
if (ini_get('mbstring.func_overload') & 2) {
    throw new PHPExcel_Exception('Multibyte function overloading in PHP must be disabled for string functions (2).');
}
PHPExcel_Shared_String::buildCharacterSets();


class PHPExcel_Autoloader
{
    public static function Register() {
        if (function_exists('__autoload')) {
            //    Register any existing autoloader function with SPL, so we don't get any clashes
            spl_autoload_register('__autoload');
        }
        //    Register ourselves with SPL
        if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
            return spl_autoload_register(array('PHPExcel_Autoloader', 'Load'), true, true);
        } else {
            return spl_autoload_register(array('PHPExcel_Autoloader', 'Load'));
        }
    }   //    function Register()


    public static function Load($pClassName){
        if ((class_exists($pClassName,FALSE)) || (strpos($pClassName, 'PHPExcel') !== 0)) {
            //    Either already loaded, or not a PHPExcel class request
            return FALSE;
        }

        $pClassFilePath = PHPEXCEL_ROOT .
                          str_replace('_',DIRECTORY_SEPARATOR,$pClassName) .
                          '.php';

        if ((file_exists($pClassFilePath) === FALSE) || (is_readable($pClassFilePath) === FALSE)) {
            //    Can't load
            return FALSE;
        }

        require($pClassFilePath);
    }   //    function Load()

}