signup using codegniter in ajax

1<?php
2class Crud_model extends CI_Model 
3{
4	function saverecords($name,$email,$phone,$city)
5	{
6		$query="INSERT INTO `crud`( `name`, `email`, `phone`, `city`) 
7		VALUES ('$name','$email','$phone','$city')";
8		$this->db->query($query);
9	}
10}
11