从其他类动态地向类添加静态函数

Question

I have the following class, API, that 'receives' functions from other classes (just Pipelinesin this example), so API::getPipelines() returns Pipelines::getPipelines() and so on. The list of API functions will grow and this code will grow larger and larger was well, so I'm looking for a way to dyamically add these functions to the API class. For example: register_methods_from(array('Pipelines', 'Blah')). What is the best way to do this?

class API
{

/**
 * The current API instance
 */
private static $_instance = null;

[...]

/**
 * Define API funcs
 */
public static function getPipelines() {
    return Pipelines::getPipelines();
}
public static function getPipeline($id) {
    return Pipelines::getPipeline($id);
}

// etc...

Answer 1

You can use PHP's magic method __callStatic for this:

class API
{
    static function __callStatic($name, $arguments)
    {
        if ( ! method_exists('Pipelines', $name))
        {
            return null; // Or throw error
        }

        return call_user_func_array('Pipelines::' . $name, $arguments);
    }
}

You can even make Pipelines dynamic here.

Also you may want to use autoloading instead, which allows you to return an instance of Pipelines when something like $api = new API(); is used.

Hope it helps!

---

Sources:

• http://php.net/manual/en/language.oop5.overloading.php#object.callstatic
• http://php.net/manual/en/function.method-exists.php
• http://php.net/manual/en/function.call-user-func-array.php
• http://php.net/manual/en/language.oop5.autoload.php