How to use custom function for uploading files in codeigniter?

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public function upload_file() {
    // Load the file upload library
    $this->load->library('upload');

    // Set file upload configuration
    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'gif|jpg|jpeg|png';
    $config['max_size'] = 1000; // in KB

    // Initialize file upload
    $this->upload->initialize($config);

    // Check if file upload is successful
    if ($this->upload->do_upload('file_input_name')) {
        // File uploaded successfully, get the uploaded file data
        $upload_data = $this->upload->data();
        $file_name = $upload_data['file_name'];

        // You can do further processing with the uploaded file here

        // Display success message to the user
        echo 'File uploaded successfully: ' . $file_name;
    } else {
        // File upload failed, display error message
        echo 'Error uploading file: ' . $this->upload->display_errors();
    }
}