how to update values in codeigniter rest for web service - php

Question

hi all am using the following code
function update_profile_post() {
$serviceName = 'update_profile';
//getting posted values
$ip['user_id'] = trim($this->input->post('user_id'));
$ip['firstname'] = trim($this->input->post('firstname'));
$ip['lastname'] = trim($this->input->post('lastname'));
$ip['city'] = trim($this->input->post('city'));
$ip['state'] = trim($this->input->post('state'));
$ip['address'] = trim($this->input->post('address'));
$ip['phone_number'] = trim($this->input->post('phone_number'));
$ip['is_pic_changed'] = trim($this->input->post('is_pic_changed'));
$ipJson = json_encode($ip);
//validation
$ip_array[] = array("user_id", $ip['user_id'], "not_null", "user_id", "User ID is empty.");
$ip_array[] = array("firstname", $ip['firstname'], "not_null", "Firstname", "Firstname is empty.");
$ip_array[] = array("lastname", $ip['lastname'], "not_null", "lastname", "Lastname is empty.");
$ip_array[] = array("city", $ip['city'], "not_null", "city", "City is empty.");
$ip_array[] = array("state", $ip['state'], "not_null", "state", "State is empty.");
$validation_array = $this->validator->validate($ip_array);
print_r ($validation_array);
if ($validation_array !=1) {
$data['message'] = $validation_array;
$retVals = $this->clamo_lib->return_status('error', $serviceName, $data, $ipJson);
}
if ($ip['is_pic_changed'] == '1') {
$this->load->library('uploader');
$uploadPhoto = $this->uploader->upload_image($_FILES['profile_pic'], $ip);
if ($uploadPhoto == 'failed') {
$data['message'] = 'Upload failed. Please try again';
$retVals = $this->clamo_lib->return_status('error', $serviceName, $data, $ipJson);
} else {
$retVals = $this->user_model->user_update_profile_pic($ip, $uploadPhoto,$serviceName);
}
}
else{
$retVals = $this->user_model->user_update_profile($ip, $serviceName);
}
header("content-type: application/json");
echo $retVals;
exit;
}
model
function user_update_profile($input, $serviceName){
$ipJson = json_encode($input);
$updateArray = array(
'user_id' => $input['user_id'],
'firstname' => $input['firstname'],
'lastname' => $input['lastname'],
'address' => $input['address'],
'city' => $input['city'],
'state' => $input['state'],
'phone_number' => $input['phone_number'],
'user_modified_date' => date('Y-m-d H:i:s'),
);
$this->db->where('user_id', $input['user_id']);
$update = $this->db->update('users', $updateArray);
if ($update) {
$data['message'] = 'User profile updated Successfully.';
$status = $this->clamo_lib->return_status('success', $serviceName, $data, $ipJson);
} else {
$data['message'] = 'Error In Updating user profile';
$status = $this->clamo_lib->return_status('error', $serviceName, $data, $ipJson);
}
return $status;
}
here the issue is it is directly giving message updated successfully but when we are checking in db it is having all values as null what was the reason for what was wrong am doing. thanks