解析php类的注册与自动加载

<?php
final class Utils {
    private function __construct() {
    }
    public static function getClasses($pre_path = '/') {
        $classes = array(
                'DBConfig' => $pre_path.'DBConfig/DBConfig.php',
                'User' => $pre_path.'Model/User.php',
                'Dao' => $pre_path.'Dao/Dao.php',
                'UserDao' => $pre_path.'Dao/UserDao.php',
                'UserMapper' => $pre_path.'Mapping/UserMapper.php',
        );
        return $classes;
    }
}
?>

<?php
require_once '/Utils/Utils.php';
final class Init {

    /**
     * System config.
     */
    public function init() {
        // error reporting - all errors for development (ensure you have
        // display_errors = On in your php.ini file)
        error_reporting ( E_ALL | E_STRICT );
        mb_internal_encoding ( 'UTF-8' );
        //registe classes
        spl_autoload_register ( array ($this,'loadClass' ) );
    }

    /**
     * Class loader.
     */
    public function loadClass($name) {
        $classes = Utils::getClasses ();
        if (! array_key_exists ( $name, $classes )) {
            die ( 'Class "' . $name . '" not found.' );
        }
        require_once $classes [$name];
    }
}
$init = new Init ();
$init->init ();
?>

<?php
require_once 'Init.php';
$dao = new UserDao();
$result = $dao->findByName('zcl');
?>