Codeigniter: Create New Helper

CodeIgniter: Create new helper?

A CodeIgniter helper is a PHP file with multiple functions. It is not a class

Create a file and put the following code into it.

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

if ( ! function_exists('test_method'))
{
    function test_method($var = '')
    {
        return $var;
    }   
}

Save this to application/helpers/ . We shall call it "new_helper.php"

The first line exists to make sure the file cannot be included and ran from outside the CodeIgniter scope. Everything after this is self explanatory.

Using the Helper

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This can be in your controller, model or view (not preferable)

$this->load->helper('new_helper');

echo test_method('Hello World');

If you use this helper in a lot of locations you can have it load automatically by adding it to the autoload configuration file i.e. <your-web-app>\application\config\autoload.php.

$autoload['helper'] = array('new_helper');

-Mathew

How to create and load new helper in CodeIgniter 4

It's not mentioned in documents but remember to add a suffix _helper to filename of your helper otherwise it will not work in codeigniter 4.

For example if you have created a helper xxx.php, change it to xxx_helper.php.

To load a helper you can use helper function (Like: helper('xxx.php');) or add it to $helpers array that is an protected property in BaseController

How to create helper in codeigniter?

You can only use "MY_" prefix when CodeIgniter has built-in same-name helper (ajax_helper).
Please change the file name "my_ajax_helper.php" into "ajax_helper.php" and use $this->load->helper('ajax');

The "MY_" prefix is only use to extend CI's built-in core helper (same rule on controller, model, etc.),
for example, you can extend url_helper with my_url_helper, and load it by $this->load->helper('url');, not 'my_url', but you cannot create you own helper with this prefix.

Update:
Oops, sorry I found my answer maybe is wrong, CI could load custom helper with 'my_ajax' in my test. Maybe another probably reason is the file / folder permission?

Update: I checked CI's code and found it only output this message when file_exists() is return false, it means helper file not exists. So problem maybe cause by the file name, path, or letter case of ajax_helper.php.

Code Igniter Custom Helper

Using $this when not in object context

This simply means you can not use the $this keyword outside of an object(class),
as @Kryten pointed out.

Helpers are generally only used for embedding in html, such as formatting data.

<p><?php echo formatHelper(escape($var)); ?></p>

What you need to do is read up a little on creating a Library.

Creating my own Helper in Codeigniter

You need to assign function return value to the variable:

$result = percentage($num1, $num2);

so you can print it:

print_r($result);

codeigniter new helper is not load

Let's see what des doc says :

Loading a helper file is quite simple using the following function:
$this->load->helper('name');

Where name is the file name of the helper, without the .php file
extension or the "helper" part.

For example, to load the URL Helper file, which is named
url_helper.php, you would do this: $this->load->helper('url');

It clearly suggests that CI will look for a file named xxx_helper.php.
In you case, when load getdata, CI will look for getdata_helper.php inside application/helpers .

You just have to rename your file to make it work.

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