Problema CodeIgniter

[rmman11]

stiu ca intr-un fisier json se scrie asa :

{
"title": "List of users",
"users": [
{
"id": "17",
"user_id": "17",
"username": "TeddyA",
"usertype": "user",
"name": "Teddy Altman",
"companyName": "Teddy SRL"
}
]
}
Cum as putea face un import a datelor dintr-un fisier JSON in CodeIgniter?

eu m-am gandit la un fel de uploadfile pe o pagina si un button submit si as dori si alte sugestii.