spl_autoload_register在不同的目录中

Question

/htdocs
    /classes
        DB.class.php
        USER.class.php
    /core
        init.php
    /ajax
        data.php
    /require
    ....
    ....

    index.php

inside init.php I have this function.

spl_autoload_register(function($class) {
           require_once 'classes/' . $class . '.class.php';
    });

The problem is that I have this USER class which needs some other classes (database class etc) and is used in some files inside ajax folder and in some files in the require folder. If I fix the require path for init.php in the USER class to use it for a file in the require folder it does not work for a file in ajax folder and vice-versa. Does anyone know how to fix this problem?

warning: require_once(../core/init.php): failed to open stream: no such file or directory in c:\apache24\htdocs\classes\user.class.php on line 3

this is USER class

Line 3: require_once 'core/init.php';

Answer 1

You could define multiple include paths

define('DS', DIRECTORY_SEPARATOR);
define('PS', PATH_SEPARATOR);
define('BP', dirname(__FILE__));

$paths = array(
    BP . DS . 'classes',
    BP . DS . 'core',
    BP . DS . 'ajax',
    get_include_path()
);

$includePaths = implode(PS, $paths);
set_include_path($includePaths);