src/lib/models/seriesOfLetters.php

<?php
class seriesOfLetters extends \Phalcon\Mvc\Model
{
    public $name;
    public $letters;
    public $period_int;
    public $period_val;
    public $status;
    public function getSource()
    {
        return "series_of_letters";
    }
    public function getDays(){
        return [
            ['val'=>'1','name'=>'понедельник'],
            ['val'=>'2','name'=>'вторник'],
            ['val'=>'3','name'=>'среда'],
            ['val'=>'4','name'=>'четверг'],
            ['val'=>'5','name'=>'пятница'],
            ['val'=>'6','name'=>'суббота'],
            ['val'=>'7','name'=>'воскресенье'],
        ];
    }
    public function isActive($first_delivery,$day){
        if($first_delivery==$day){
            return true;
        }else{
            return false;
        }
    }
}