eulerfx

A state machine is defined as follows:

• Input - a set of inputs
• Output - a set of outputs
• State - a set of states
• S0 ∈ S - an initial state
• T : Input * State -> Output * State - a transition function

If you model your services (aggregates, projections, process managers, sagas, whatever) as state machines, one issue to address is management of State. There must be a mechanism to provide State to the state machine, and to persist resulting State for subsequent retrieval. One way to address this is by storing State is a key-value store. Another way is to use a SQL database. Yet another way is event sourcing. The benefit of even sourcing is that you never need to store State itself. Instead, you rely on the Output of a service to reconstitute state. In order to do that, the state machine transition function needs to be factored into two functions as follows:

ircmaxell

<?php

function runMigration() {
    foreach (getUsers() as $user) {
        $hash = $user->hash;
        list ($oldhash, $oldsalt) = explode(':', $hash, 2);
        $newHash = password_migrate_create($oldhash, $oldsalt, PASSWORD_BCRYPT);
        $user->hash = $newHash;
        saveUser($user);
    }

ck-on

<?php
/*
OCP - Opcache Control Panel   (aka Zend Optimizer+ Control Panel for PHP)
Author: _ck_   (with contributions by GK, stasilok)
Version: 0.1.7
Free for any kind of use or modification, I am not responsible for anything, please share your improvements

* revision history
0.1.7  2015-09-01  regex fix for PHP7 phpinfo
0.1.6  2013-04-12  moved meta to footer so graphs can be higher and reduce clutter

ziadoz

Awesome PHP

Awesome PHP has been relocated permanently to its own Github repository. No further updates will made to this gist.

Please open an issue for any new suggestions.