Codeigniter 4 – Helpers with Examples

What is a Helper?

- A Helper is a file that contains a collection of functions that assist with common tasks.
- Helpers are stored in the app/Helpers directory.

Creating a Helper

- Create a new file in the app/Helpers directory (e.g. my_helper.php).
- Add functions to the file to assist with common tasks.

Example: app/Helpers/my_helper.php

<?php

function my_function($param)
{
    // Do something
}

Loading a Helper

- Use the helper() function to load a Helper.
- Load a Helper in a Controller or View.

Example:

helper('my_helper');

Using a Helper Function

- Call a Helper function using the function name.

Example:

my_function('parameter');

Native Helpers

- CodeIgniter 4 provides several native Helpers for common tasks.
- Examples include the array_helper, file_helper, and form_helper.

Example:

helper('array_helper');
echo array_to_string($array);

Creating a Custom Helper

- Create a new file in the app/Helpers directory (e.g. custom_helper.php).
- Add custom functions to the file to assist with specific tasks.

Example: app/Helpers/custom_helper.php

<?php

function custom_function($param)
{
    // Do something custom
}

Loading a Custom Helper

- Use the helper() function to load a custom Helper.

Example:

helper('custom_helper');

Using a Custom Helper Function

- Call a custom Helper function using the function name.

Example:

custom_function('parameter');

I hope this helps! Let me know if you have any further questions or need more information.