What is the best way to allow plugins for a PHP application

Question

I want to create something that people can extend by using a plugin interface.

How does one go about writing 'hooks' into their code so that plugins can attach to specific events?

Answer 1

Hello @kartik,

I've used, it's an attempt to copy from Qt signals/slots mechanism, a kind of Observer pattern. Objects can emit signals. 

Every signal has an ID in the system - it's composed by sender's id + object name Every signal can be binded to the receivers, which simply is a "callable" You use a bus class to pass the signals to anybody interested in receiving them When something happens, you "send" a signal. 

Below is and example implementation

    <?php

    class SignalsHandler {
    private static $connections = array();
    private static $sender;
    public static function connect($sender, $signal, $slot) {
    if (is_object($sender)) {
            self::$connections[spl_object_hash($sender)][$signal][] = $slot;
     }
    else {
            self::$connections[md5($sender)][$signal][] = $slot;
        }
    }

Hope this works!!

Thank You!!