1. Go to this page and download the library: Download alikdex/yii2-toastr library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
alikdex / yii2-toastr example snippets
<?= \alikdex\toastr\Toastr::widget([
'toastType' => 'error',
'message' => 'This is an error.',
]);