首页 \ 问答 \ 使用__autoload包含类和使用命名空间(Use __autoload to include class and use namespace)

使用__autoload包含类和使用命名空间(Use __autoload to include class and use namespace)

是否有可能这样做?:

function __autoload($classname) {
    require_once("Facebook/". $classname .".php");
    use Facebook\$classname;
}

以便命名空间使用也可以吗?

问候


is there a possibility to do this?:

function __autoload($classname) {
    require_once("Facebook/". $classname .".php");
    use Facebook\$classname;
}

so that the namespace use works also?

Regards


原文:https://stackoverflow.com/questions/23839594
更新时间:2020-03-20 22:15

最满意答案

首先,我认为你可以使用class_alias函数( http://www.php.net/manual/en/function.class-alias.php )来做到这一点。 它可能看起来像这样:

function __autoload($classname) {
    require_once("Facebook/". $classname .".php");
    class_alias("Facebook\$classname", $classname, false); // last param is false so this doesn't create an infinite loop
}

但是,即使您可以这样做,也不应该动态导入名称空间和别名类。 它会使你的代码真的很混乱,它基本上否定了命名空间的功能(因为你包含的每个命名空间都会被别名/导入)。 在实际使用类/命名空间的文件中,最好明确您的别名和导入。 它更清晰。

__autoload旨在隐藏实际包含类的文件的功能。 使用类的文件不必知道如何包含该类,只是它可以访问。 别名/导入不是这样。 知道导入名称空间或类别名是非常重要的。


First, I think you can do this using the class_alias function (http://www.php.net/manual/en/function.class-alias.php). It would probably look something like this:

function __autoload($classname) {
    require_once("Facebook/". $classname .".php");
    class_alias("Facebook\$classname", $classname, false); // last param is false so this doesn't create an infinite loop
}

However, even if you can do it, you shouldn't dynamically import namespaces and alias classes like that. It will make your code really confusing, and it essentially negates the function of namespaces (since every namespace you include will be aliased/imported). It's better to be explicit about your aliases and imports, in the files that actually use the class/namespace. It's much clearer.

__autoload is meant to hide the functionality of how you actually include the files containing your classes. It's not necessary for the files that use a class to know how that class is included, just that it's accessible. That's not true with aliasing/importing. It's functionally important to know that a namespace is imported or that a class is aliased.

2014-05-23

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