Use utf8mb4 instead of utf8 in MySQL database connection string

_posts/07-04-01-Interacting-via-Code.md

@@ -48,7 +48,7 @@ logic in and you have a "View", which is very nearly [MVC] - a common OOP archit
 
 {% highlight php %}
 <?php
-$db = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8', 'username', 'password');
+$db = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8mb4', 'username', 'password');
 
 // Make your model available
 include 'models/FooModel.php';