如何使用spl_autoload_register？

class Manage
{

spl_autoload_register(function($class) {
    include $class . '.class.php';
});
}

Say I have some code like the above. I chose to use the anonymous function method of loading classes, but how is this used? How exactly does it determine which '$class' to load?

说我有一些像上面这样的代码。我选择使用加载类的匿名函数方法，但这是如何使用的？它究竟是如何确定加载哪个'$ class'的？

2 个解决方案

#1

You can't put the code there. You should add the SPL register after your class. If you wanted to register a function inside the Manage class you could do:

你不能把代码放在那里。你应该在课后添加SPL寄存器。如果你想在Manage类中注册一个函数，你可以这样做：

class Manage {
    public static function autoload($class) {
        include $class . '.class.php';
    }
}

spl_autoload_register(array('Manage', 'autoload'));

However, as you demonstrated you can use an anonymous function. You don't even need a class, so you can just do:

但是，正如您演示的那样，您可以使用匿名函数。你甚至不需要课程，所以你可以这样做：

spl_autoload_register(function($class) {
    include $class . '.class.php';
});

Either way, the function you specify is added to a pool of functions that are responsible for autoloading. Your function is appended to this list (so if there were any in the list already, yours will be last). With this, when you do something like this:

无论哪种方式，您指定的函数都会添加到负责自动加载的函数池中。您的功能将附加到此列表中（因此，如果列表中已有任何功能，则您的功能将是最后一个）。有了这个，当你做这样的事情时：

UnloadedClass::someFunc('stuff');

PHP will realize that UnloadedClass hasn't been declared yet. It will then iterate through the SPL autoload function list. It will call each function with one argument: 'UnloadedClass'. Then after each function is called, it checks if the class exists yet. If it doesn't it continues until it reaches the end of the list. If the class is never loaded, you will get a fatal error telling you that the class doesn't exist.

PHP将意识到尚未声明UnloadedClass。然后它将遍历SPL自动加载功能列表。它将使用一个参数调用每个函数：'UnloadedClass'。然后在调用每个函数之后，它会检查该类是否存在。如果没有，它会继续，直到它到达列表的末尾。如果从未加载该类，您将收到一个致命错误，告诉您该类不存在。

2 个解决方案

#1

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