所以我在answer之后做了改变,

$reflection = new ReflectionClass($class_name);

# Return boolean if it is an interface.
if ($reflection->isInterface())
{
    $file_name = 'interface_'.strtolower(array_pop($file_pieces)).'.PHP';
}
else
{
    $file_name = 'class_'.strtolower(array_pop($file_pieces)).'.PHP';

}

我测试了它,但是这个自动加载器类根本不加载接口.我错过了什么想法？

例如,这是我的界面文件,

interface_methods.PHP

及其内容,

interface methods 
{
    public function delete();
}

下面是我的整个自动加载器类.

class autoloader
{
    /**
     * Set the property.
     */
    public $directory;
    public $recursive;

    public function __construct($directory,$recursive = array('search' => 'models') ) 
    {
        # Store the data into the property.
        $this->directory = $directory;
        $this->recursive = $recursive;

        # When using spl_autoload_register() with class methods,it might seem that it can use only public methods,though it can use private/protected methods as well,if registered from inside the class:
        spl_autoload_register(array($this,'get_class'));
    }

    private function get_class($class_name)
    {
        # List all the class directories in the array.
        if ($this->recursive)
        {
            $array_directories =  self::get_recursive_directory($this->directory);
        }
        else
        {
            if (is_array($this->directory)) $array_directories =  $this->directory;
            else $array_directories =  array($this->directory);
        }

        # Determine the class is an interface.
        $reflection = new ReflectionClass($class_name);

        $file_pieces = explode('\\',$class_name);

        # Return boolean if it is an interface.
        if ($reflection->isInterface())
        {
            $file_name = 'interface_'.strtolower(array_pop($file_pieces)).'.PHP';
        }
        else
        {
            $file_name = 'class_'.strtolower(array_pop($file_pieces)).'.PHP';

        }

        # Loop the array.
        foreach($array_directories as $path_directory)
        {
            if(file_exists($path_directory.$file_name)) 
            {
                include $path_directory.$file_name;
            } 
        }

    }

    public function get_recursive_directory($directory)
    {
        $iterator = new RecursiveIteratorIterator
                    (
                        new RecursiveDirectoryIterator($directory),RecursiveIteratorIterator::CHILD_FIRST
                    );

        # This will hold the result.
        $result = array();

        # Loop the directory contents.
        foreach ($iterator as $path) 
        {

            # If object is a directory and matches the search term ('models')...
            if ($path->isDir() && $path->getBasename() === $this->recursive['search']) 
            {

                # Add it to the result array.
                # Must replace the slash in the class - dunno why!
                $result[] = str_replace('\\','/',$path).'/';
                //$result[] = (string) $path . '/';

            }

        }

        # Return the result in an array.
        return $result;
    }
}