<?php
// Daniel Dvorkin
// Based on code by Ryan McCue

class WPPlugin_Base {

    public static function _register_hooks($parent) {

        $prefixes = array('filter' => 'filter_', 'action' => 'action_');

        $self = new ReflectionClass($parent);

        foreach ($self->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
            $params = $method->getNumberOfParameters();
            $hooks = array('filter' => array(), 'action' => array());

            if ($prefixes['filter'] === '' || $prefixes['action'] === '') {
                $hooks['filter'][$method->name] = apply_filters($method->name . '_priority', 10);
            }

            elseif ($enable_prefixes === true && strpos($method->name, $prefixes['filter']) === 0) {
                $hook = substr($method->name, strlen($prefixes['filter']));
                $hooks['action'][$hook] = apply_filters($method->name . '_priority', 10);
            }

            elseif ($enable_prefixes === true && strpos($method->name, $prefixes['action']) === 0) {
                $hook = substr($method->name, strlen($prefixes['action']));
                $hooks['action'][$hook] = apply_filters($method->name . '_priority', 10);
            }

            foreach ($hooks['filter'] as $hook => $priority) {
                call_user_func(array($parent, 'add_filter'), $hook, $method->name, $priority, $params, $parent);
            }
            foreach ($hooks['action'] as $hook => $priority) {
                call_user_func(array($parent, 'add_action'), $hook, $method->name, $priority, $params, $parent);
            }
        }
    }
}


class WPPlugin extends WPPlugin_Base {

    protected function __construct() {
        $this->_register_hooks( $this);
    }

    protected function add_filter($hook, $method = null, $priority = 10, $params = null) {
        if ($method === null) {
            $method = $hook;
        }
        elseif (is_int($method)) {
            $priority = $method;
            $method = $hook;
        }

        if (!method_exists($this, $method)) {
            throw new InvalidArgumentException('Method does not exist');
        }

        if ($params === null) {
            $ref = new ReflectionMethod($this, $method);
            $params = $ref->getNumberOfParameters();
        }

        return add_filter($hook, array($this, $method), $priority, $params);
    }


    protected function add_action($hook, $method = null, $priority = 10, $params = null) {
        if ($method === null) {
            $method = $hook;
        }
        elseif (is_int($method)) {
            $priority = $method;
            $method = $hook;
        }

        if (!method_exists($this, $method)) {
            throw new InvalidArgumentException('Method does not exist');
        }

        if ($params === null) {
            $ref = new ReflectionMethod($this, $method);
            $params = $ref->getNumberOfParameters();
        }

        return add_action($hook, array($this, $method), $priority, $params);
    }
}


class Example extends WPPlugin {
    public function __construct() {
        parent::__construct();
    }

    public function action_init($a) {
        echo 'init!';
    }

    public function filter_the_content_priority(){ return 3; }
    public function filter_the_content($content){
        return $content;
    }

}

$plugin = new Example();

?>