1. Go to this page and download the library: Download coercive/iterator 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/ */
coercive / iterator example snippets
foreach (new MbStrIterator('string') as $i => $chr) {
echo "$i => $chr \n";
}