怎么简单实现工作流？

<?php
class process{

   const STATE_1   = 1;
   const STATE_2   = 2;
   const STATE_3   = 3;
   const STATE_4   = 4;
   const STATE_5   = 5;
   const STATE_ALL = 99;

   private $state     = null;
   private $statesLog = [];

   public function setState($state)
   {
       if (!$this->checkRoute($state)) {
           return false;
       }
       $this->state = $state;
       return true; 
   }

   protected function routes()
   {
       return [
           static::STATE_1=>[
               &#39;id&#39;      =>static::STATE_1,
               &#39;name&#39;    =>&#39;状态1&#39;,
               &#39;desc&#39;    =>&#39;状态1的描述&#39;,
               &#39;to&#39;      =>[static::STATE_3, static::STATE_4],
               &#39;actions&#39; =>[Actions::AC1, Actions::AC3],
               &#39;hooks&#39;   =>[...],
           ]
           ...
       ];
   }

}

class Actions{
   const AC1 = 1;
   const AC2 = 2;
   const AC3 = 3;

   public static function actions()
   {
       return [
           static::AC1 =>[
               &#39;id&#39;   =>static::AC1,
               &#39;name&#39; =>&#39;AC1&#39;,
               &#39;action&#39;=>[
                   &#39;do&#39;    =>[&#39;nameSpace&#39;, &#39;className&#39;, &#39;methodName&#39;],
                   &#39;route&#39; =>&#39;/tools/sms/push&#39;,
                   &#39;attr&#39; =>[&#39;class&#39;=>&#39;hight_light warning&#39;],
               ],
           ]
           ...
       ];
   }

   public static function getAction($actionId)
   {
       $actions = static::actions();
       return $actions[$actionId] ?? null;
   } 
}