search from database using text field and search button

[eluser]skhan[/eluser]
Hi! I am newbie here.
i want to create search from database using text field and search button without ajax, javascript or jquery.
i want php using codeigniter framework,

here is my table ('inventory') and my fields are ('id', 'item', 'unitprice', 'qty')

when i search 'an' i want to view all item starts with 'an',

i do login,CRUD, mvc using codeigniter but this one is difficult for me..
someone help me please.

thanks in advance!