Event.php

<?php

namespace App\Events;

abstract class Event
{
    protected function isNumeric($worker_id)
    {
        if (! is_numeric($worker_id)) {
            throw new \Exception('Param $worker_id is not numeric.');
        }

        return;
    }



    /**
     * Entity array contract
     * @var array
     */
    protected $entityKeys = [
        'actual',
        'before',
        'related',
    ];

    /**
     * Check entities with contract and convert entities to json format
     *
     * @param array $entities
     * @return array
     * @throws \Exception
     */
    protected function convertEntities($entities = []) {

        if (! empty(array_filter($entities))) {
            foreach ($this->entityKeys as $key) {
                if(!array_key_exists($key, $entities)){
                    $entities[$key] = null;
                } else {
                    $entities[$key] = $entities[$key]->toJson();
                }
            }
        }

        return $entities;
    }

    /**
     * Assign global scope variable for actionlog
     *
     * @param $name
     * @param $entities
     * @param $note
     * @throws \Exception
     */
    protected function assignActionlog($name, $entities, $note)
    {
        $this->name = $name;
        $this->entities = $this->convertEntities($entities);
        $this->note = $note;
    }
}