hemeilei-code/routes/web.php

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/key/{key}', 'HomeController@key')->name('key');



Route::get('/test', function () {
    $b = 500;
    for ($i = 1; $i < 1000; $i++) {
        $zNum = $i % $b;
        echo "{$zNum}=>{$i}" . '</br>';
    }
});