Codeigniter 4 – Creating a Library with Example

Creating a Library

- Create a new file in the app/Libraries directory.
- Extend the CodeIgniter\Libraries\BaseLibrary class.

Example:

namespace App\Libraries;

use CodeIgniter\Libraries\BaseLibrary;

class MyLibrary extends BaseLibrary
{
    public function doSomething()
    {
        // Library code here
    }
}

Loading a Library

- Use the library() method to load a library.

Example:

$myLibrary = library('MyLibrary');

Using a Library

- Call methods on the library object.

Example:

$myLibrary->doSomething();

Creating a Library with Dependencies

- Use the __construct() method to inject dependencies.

Example:

namespace App\Libraries;

use CodeIgniter\Libraries\BaseLibrary;
use CodeIgniter\Database\BaseConnection;

class MyLibrary extends BaseLibrary
{
    protected $db;

    public function __construct(BaseConnection $db)
    {
        $this->db = $db;
    }

    public function doSomething()
    {
        // Use the database connection
        $this->db->query('SELECT * FROM users');
    }
}

Creating a Library with Configuration

- Use the __construct() method to inject configuration.

Example:

namespace App\Libraries;

use CodeIgniter\Libraries\BaseLibrary;
use CodeIgniter\Config\BaseConfig;

class MyLibrary extends BaseLibrary
{
    protected $config;

    public function __construct(BaseConfig $config)
    {
        $this->config = $config;
    }

    public function doSomething()
    {
        // Use the configuration
        echo $this->config->get('app.name');
    }
}

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

Note: Libraries in CodeIgniter 4 provide a way to organize and reuse code. They can be used to perform specific tasks, interact with external services, or provide utility functions.