baoshi-was/app/Observers/MenuObserver.php

<?php

namespace App\Observers;

use App\Menu;

class MenuObserver
{
    /**
     * Handle the menu "created" event.
     *
     * @param  \App\Menu  $menu
     * @return void
     */
    public function created(Menu $menu)
    {
        if (env('APP_ENV')!='production')return;
        $txt = "INSERT INTO menus";
        $columns = "(";
        $values = "(";
        foreach ($menu->toArray() as $col=>$val){
            $columns .= "{$col},";
            if ($col=='parent_id' && !$val) $values .= "null,";
            else $values .= "'{$val}',";
        }
        $columns = mb_substr($columns,0,-1);
        $values = mb_substr($values,0,-1);
        $txt .= "{$columns}) VALUES{$values});\r\n";
        $this->write($txt);
    }

    /**
     * Handle the menu "updated" event.
     *
     * @param  \App\Menu  $menu
     * @return void
     */
    public function updated(Menu $menu)
    {
        if (env('APP_ENV')!='production')return;
        $txt = "UPDATE menus SET ";
        foreach ($menu->toArray() as $col=>$val){
            if ($col=='parent_id' && !$val) $txt .= "{$col}=null,";
            else $txt .= "{$col}='{$val}',";
        }
        $txt = mb_substr($txt,0,-1);
        $txt .= " WHERE id = {$menu->id};\r\n";
        $this->write($txt);
    }

    /**
     * Handle the menu "deleted" event.
     *
     * @param  \App\Menu  $menu
     * @return void
     */
    public function deleted(Menu $menu)
    {
        if (env('APP_ENV')!='production')return;
        $txt = "DELETE FROM menus WHERE id = {$menu->id};\r\n";
        $this->write($txt);
    }

    private function write($txt)
    {
        $myfile = @fopen(base_path()."/database/data/menus.data", "a+");
        fwrite($myfile, $txt);
        fclose($myfile);
    }
}