从不同文件夹自动加载类 [英] Autoload classes from different folders

问题描述

这是我自动加载controllers文件夹中的所有类的方式，

This is how I autoload all the classes in my controllers folder,

# auto load controller classes
    function __autoload($class_name) 
    {
        $filename = 'class_'.strtolower($class_name).'.php';
        $file = AP_SITE.'controllers/'.$filename;

        if (file_exists($file) == false)
        {
            return false;
        }
        include ($file);
    }

但是我在models文件夹中也有类，我也想自动加载它们-我该怎么办?我应该复制上面的自动加载并仅将路径更改为models/(但不是重复吗?)?

But I have classes in models folder as well and I want to autoload them too - what should I do? Should I duplicate the autoload above and just change the path to models/ (but isn't this repetitive??)?

谢谢.

这些是控制器文件夹中我的班级文件名:

these are my classes file names in the controller folder:

class_controller_base.php
class_factory.php
etc

这些是我在class文件夹中的class文件名:

these are my classes file names in the model folder:

class_model_page.php
class_model_parent.php
etc

这通常是我命名控制器类类的方式(我使用下划线和小写)，

this is how I name my controller classes class usually (I use underscores and lowcaps),

class controller_base 
{
...
}

class controller_factory
{
...
}

这通常是我为模型类类命名的方式(我使用下划线和小写)，

this is how I name my model classes class usually (I use underscores and lowcaps),

class model_page 
    {
    ...
    }

    class model_parent
    {
    ...
    }

推荐答案

您应命名您的类，以便将下划线(_)转换为目录分隔符(/).一些PHP框架可以做到这一点，例如Zend和Kohana.

You should name your classes so the underscore (_) translates to the directory separator (/). A few PHP frameworks do this, such as Zend and Kohana.

因此，您将类命名为Model_Article并将文件放置在classes/model/article.php中，然后自动加载就可以了...

So, you name your class Model_Article and place the file in classes/model/article.php and then your autoload does...

function __autoload($class_name) 
{
    $filename = str_replace('_', DIRECTORY_SEPARATOR, strtolower($class_name)).'.php';

    $file = AP_SITE.$filename;

    if ( ! file_exists($file))
    {
        return FALSE;
    }
    include $file;
}

还请注意，您可以使用 spl_autoload_register() 来使任何功能成为自动加载功能.它还更加灵活，允许您定义多个自动加载类型的函数.

Also note you can use spl_autoload_register() to make any function an autoloading function. It is also more flexible, allowing you to define multiple autoload type functions.

如果必须有多个自动加载功能，则spl_autoload_register()允许这样做.它有效地创建了自动加载功能队列，并按照定义的顺序遍历每个功能.相比之下，__autoload()只能定义一次.

If there must be multiple autoload functions, spl_autoload_register() allows for this. It effectively creates a queue of autoload functions, and runs through each of them in the order they are defined. By contrast, __autoload() may only be defined once.

修改

注意::自PHP 7.2.0起， __ autoload 已被弃用.强烈建议不要使用此功能.有关更多详细信息，请参考PHP文档. http://php.net/manual/zh/function.autoload.php

Note : __autoload has been DEPRECATED as of PHP 7.2.0. Relying on this feature is highly discouraged. Please refer to PHP documentation for more details. http://php.net/manual/en/function.autoload.php

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