问题
According to http://php.net/manual/en/language.oop5.autoload.php the magic function __autoload() will become DEPRECATED and DELETED (!) in upcoming PHP versions. The official alternative is spl_autoload(). See http://www.php.net/manual/en/function.spl-autoload.php. But the php manual does not explain the proper use of this baby.
My question: How to replace this (my automatic class autoloader)
function __autoload($class) {
include 'classes/' . $class . '.class.php';
}
with a version with spl_autoload() ? Problem is: I cannot figure out how to give that function a path (it only accepts namespaces).
By the way: There are a lot of threads regarding this topic here on SO.com, but none gives a clean & simple solution that replaces my sexy one-liner.
回答1:
You need to register autoload functions with spl_autoload_register. You need to provide a "callable". The nicest way of doing this, from 5.3 onwards, is with an anonymous function:
spl_autoload_register(function($class) {
include 'classes/' . $class . '.class.php';
});
The principal advantage of this against __autoload is of course that you can call spl_autoload_register multiple times, whereas __autoload (like any function) can only be defined once. If you have modular code, this would be a significant drawback.
2018 update to this: there shouldn't really be that many occasions when you need to roll your own autoloader. There is a widely accepted standard (called PSR-4) and several conforming implementations. The obvious way of doing this is using Composer.
来源：https://stackoverflow.com/questions/10687804/how-to-use-spl-autoload-as-autoload-goes-deprecated