来自不同文件夹的自动加载类

Question

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);
    }

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??)?

Thanks.

EDIT:

these are my classes file names in the controller folder:

class_controller_base.php
class_factory.php
etc

these are my classes file names in the model folder:

class_model_page.php
class_model_parent.php
etc

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

class controller_base 
{
...
}

class controller_factory
{
...
}

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

class model_page 
    {
    ...
    }

    class model_parent
    {
    ...
    }

Answer 1

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

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;
}

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.

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.

Edit

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