How to perform this in CodeIgniter MVC

Hi,

Im new in CodeIgniter,

I just want to know how to perform this in codeigniter in correct and clean way.

PHP Code:

<?php
$db = new mysqli("blah blah blah");

$query = $db->query("SELECT * FROM `users`");

while($data = $query->fetch_array()) {
$FirstName = $data['FirstName'];
$FirstName = str_replace("aaa","***",$FirstName);
echo $FirstName."<br>";
} 


I just want to perform while loop in my view with some methods like str_replace inside result_array();

God Bless CI Contributors