Laravel Create Constant

Step1: Create folder in \app\Constants

Step2:

<?php
namespace App\Constants;

abstract class ContactTypes
{
    const Mobile_Contact    = 1;
    const HomeTel_Contact   = 2;
    const WorkTel_Contact   = 3;
}

Step 3: Use

use App\Constants\ContactTypes;
ContactTypes::Mobile_Contact

other Sample

<?php
namespace App\Constants;

abstract class Countries
{
    public static $getNameByAlias = [
        'ir' => 'iran',
        'usa' => 'usa',
    ];
    public static $getCode = [
        'ir' =>  1,
        'usa' => 2,
    ];
    public static $getNameByCode = [
        '1' => 'iran',
        '2' => 'usa',
    ];
    public static $getAliasByCode = [
        '1' => 'ir',
        '2' => 'usa',
    ];
    public static $getAliasByCodeWithoutIran = [
        '2' => 'usa',
    ];
}
<?php

namespace App\Http\Controllers;

use App\Constants\Countries;
use Illuminate\Http\Request;

class ConstantController extends Controller
{
    public function getCountries(Request $request)
    {
        return response()->json(['data' => Countries::$getAliasByCodeWithoutIran], 200);
    }
}

Enjoy