Message: Undefined variable: data - CodeIgniter

问题

Hi guys I have this code and I am not sure what I am doing wrong, data is being defined as far as I can see, these are the errors I am getting:

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: data

Filename: models/site_model.php

Line Number: 14
A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /Applications/XAMPP/xamppfiles/htdocs/BLOCK/system/core/Exceptions.php:185)

Filename: core/Common.php

Line Number: 442
A Database Error Occurred

You must use the "set" method to update an entry.

Filename: /Applications/XAMPP/xamppfiles/htdocs/BLOCK/models/site_model.php

Line Number: 14

controller:

<?php
class Site extends CI_Controller {

function index(){

    $this->load->view('option_view');
}

function create(){

    $data = array(
        'subject' => $this->input->post('subject'),
        'body' => $this->input->post('body')
    );

    $this->Site_model->add_record($data);
    $this->index();

}

}


?>

model:

<?php

class Site_model extends CI_Model {

function get_records()

{
    $query = $this->db->get('items');
    return $query->result();
}

function add_record()
{
    $this->db->insert('items', $data);
    $return;
}

function update_record()
{
    $this->db->where('id', 1);
    $this->db->update('items', $data);

}

function delete_record()
{
    $this->db->where('id', $this->url->segment(3));
    $this->db->delete('items');

}

}





?>

and the view:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<title>option_view</title>
<style type="text/css" media="screen">
label {display:block;}
</style>
</head>

<body>
<h2>Create</h2>
<?php echo form_open('site/create'); ?>

<p>
    </label for="subject">Subject</label>
    <input type="text" name="subject" id="subject">
</p>

<p>
    </label for="body">Body</label>
    <input type="text" name="body" id="body">
</p>
<p>
<input type="submit" value="Submit">    
</p>
<?php echo form_close();?>
 </body>
 </html>

What do you guys reckon?

Much appreciated

回答1:

The method in your models aren't expecting a parameter. For example:

Change:

function add_record()

to:

function add_record($data)

回答2:

You never pass $data to your methods. This is a scope issue.

function add_record()
{
    $this->db->insert('items', $data);
    $return;
}

In this case, add_record() has no idea what $data is (and treats it as null because it hasn't been defined.

Variable Scope

回答3:

In these methods:

function add_record()
{
    $this->db->insert('items', $data);
    $return;
}

function update_record()
{
    $this->db->where('id', 1);
    $this->db->update('items', $data);

}

You have not passed data to the methods, so $data is undefined.

来源：https://stackoverflow.com/questions/11748324/message-undefined-variable-data-codeigniter

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