useful.php

<?php

// check from cache, if not exist get using closure, 
// then save to cache
$value = Cache::remember('users', $seconds, function () {
    return DB::table('users')->get();
});

// wrap closure using transaction from DB facade
use Illuminate\Support\Facades\DB;
DB::transaction(function () {
    DB::update('update users set votes = 1');
 
    DB::delete('delete from posts');
});