如何使用 spl_autoload() 而不是 __autoload() [英] How to use spl_autoload() instead of __autoload()
问题描述
根据http://php.net/manual/en/language.oop5.autoload.php 魔法函数 __autoload()
在即将到来的 PHP 版本中将成为 DEPRECATED 和 DELETED (!).官方的替代方法是 spl_autoload()
.参见 http://www.php.net/manual/en/function.spl-autoload.php.但是PHP手册并没有说明这个宝贝的正确使用方法.
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.
我的问题:如何用带有 spl_autoload()
的版本替换这个(我的自动类自动加载器)?
My question: How to replace this (my automatic class autoloader) with a version with spl_autoload()
?
function __autoload($class) {
include 'classes/' . $class . '.class.php';
}
问题:我不知道如何为该函数指定路径(它只接受命名空间).
Problem: I cannot figure out how to give that function a path (it only accepts namespaces).
顺便说一下,SO 上有很多关于这个主题的主题,但没有一个提供干净的 &简单的解决方案,取代了我性感的单衬.
By the way, there are a lot of threads regarding this topic here on SO, but none gives a clean & simple solution that replaces my sexy one-liner.
推荐答案
您需要使用 spl_autoload_register
.您需要提供 "callable".从 5.3 开始,最好的方法是使用匿名函数:
You need to register autoload functions with spl_autoload_register
. You need to provide a "callable". The nicest way of doing this, from 5.3 onwards, is with an anonymous function:
spl_autoload_register(function($class) {
include 'classes/' . $class . '.class.php';
});
这相对于 __autoload
的主要优点当然是您可以多次调用 spl_autoload_register
,而 __autoload
(像任何函数一样)可以只能定义一次.如果您有模块化代码,这将是一个重大缺陷.
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 年更新:您需要推出自己的自动加载器的情况真的不应该太多.有一个被广泛接受的标准(称为 PSR-4)和几个符合标准的实现.这样做的明显方法是使用 Composer.
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.
这篇关于如何使用 spl_autoload() 而不是 __autoload()的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!