Retirar if de uma Rotina

Bem pessoal sou novo na área de programação, estou fazendo um curso aqui com vocês e correndo a atras de outros recursos.
Enfim uma empresa me chamou para atualizar o site e me deparei com esse problema.
Me pediram para tirar a validação de um envio de arquivos, só que estou inseguro de fazer vou passar o código espero que me ajudem.

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

require_once('application_controller.php');

include_once("./application/libraries/MPDF56/mpdf.php");

class Vacancies_Controller extends Application_Controller {

function __construct(){
parent::__construct();
$this->authenticate_user();
}



public function index($wave = '', $auditor_register = ''){

$this->authorize(array('coordinator', 'auditor'));
$current_user = $this->current_user();

$this->data['waves_list'] = $waves = $this->vacancy->waves();
$wave = empty($wave) ? $waves[0]['wave'] : $wave;

$this->data['wave'] = $wave;

if($current_user->type == 'auditor' || $auditor_register ){

if($current_user->type == 'auditor'){
$auditor_register = $this->current_user()->register_id;
}

$this->data['auditor'] = $auditor_register;
$this->data['open_vacancies'] = $this->vacancy->open_vacancies($auditor_register, $wave);
$this->data['close_vacancies'] = $this->vacancy->close_vacancies($auditor_register, $wave);

}
elseif($current_user->type == 'coordinator'){

$this->data['auditors'] = $this->vacancy->auditors_by_coordinator($current_user, $wave);
$this->view = 'vacancies/auditors';
}


}


public function vacancy($auditor_register = ''){

try{
$user = $this->user->find_by_register_id($auditor_register);
$this->data['open_vacancies'] = $this->vacancy->open_vacancies($current_user);
$this->data['close_vacancies'] = $this->vacancy->close_vacancies($current_user);
}catch(Exception $e){
$this->session->set_flashdata( array('error' => "Auditor não encontrado."));
redirect('feed', 'refresh');
}


}


public function add($wave = '', $promoter_register = ''){

try{


if($promoter_register){

$waves = $this->vacancy->wave();
$wave = empty($wave) ? $waves[0]['wave'] : $wave;


$promoter_files = $this->promoter_files->new_model();
$promoter_files->promoter_register = $promoter_register;
$promoter_files->wave = $wave;
$this->data['promoter_files'] = $promoter_files;

}



$params = $this->input->post('promoter_files');
if($params){

$promoter_files = $this->promoter_files->new_model($params);
$promoter_files->auditor_register = $this->current_user()->register_id;

if (!empty($_FILES['photo']['name'])){
$return = $promoter_files->do_upload('photo');
if($return === FALSE){
$this->form_validation->set_rules('photo', 'Imagem', 'callback_handle_upload');
}
}


if (!empty($_FILES['scanner']['name'])){
$return = $promoter_files->do_upload('scanner');
if($return === FALSE){
$this->form_validation->set_rules('scanner', 'Scanner', 'callback_handle_upload');
}
}



if( $promoter_files->save()){
$this->session->set_flashdata( array('success' => "Arquivos e nota registrado com sucesso."));
redirect('vacancies', 'refresh');
}else{
$this->view = 'vacancies/add';
$this->data['promoter_files'] = $promoter_files;
}

}


}catch(Exception $e){
$this->session->set_flashdata( array('error' => "Auditor não encontrado."));
redirect('feed', 'refresh');
}


}

public function pdf($wave = '', $promoter_register = '', $auditor_register = ''){


$waves = $this->vacancy->waves();
$wave = empty($wave) ? $waves[0]['wave'] : $wave;




$mpdf = new mPDF('', // mode - default ''
'', // format - A4, for example, default ''
0, // font size - default 0
'', // default font family
15, // margin_left
15, // margin right
10, // margin top
16, // margin bottom
9, // margin header
9, // margin footer
'L'); // L - landscape, P - portrait

$mpdf->allow_charset_conversion = true;
$mpdf->charset_in='UTF-8';

// Exibir a pagina inteira no browser
$mpdf->SetDisplayMode('fullpage');

// Cabeçalho: Seta a data/hora completa de quando o PDF foi gerado + um texto no lado direito
//$mpdf->SetHTMLHeader('<div style="border-bottom: 1px solid #000000;">Tracking Trade</div>');


// Rodapé: Seta a data/hora completa de quando o PDF foi gerado + um texto no lado direito
//$mpdf->SetFooter('{DATE j/m/Y H:i}|/|Tracking Trade');



$promoter = $this->user->find_by_register_id($promoter_register);
$html_retorno .= "<table>";
$html_retorno .= "<tr>";
$html_retorno .= "<td width='200px' style='font-size:20px;padding-left:80px;padding-top:30px;'>".$auditor_register."</td>";
$html_retorno .= "<td width='200px' style='font-size:20px;padding-left:100px;padding-top:30px;'>".$promoter->register_id."</td>";
$html_retorno .= "<td width='700px' style='font-size:20px;padding-left:40px;padding-top:30px;'>".$promoter->fullname."</td>";
$html_retorno .= "<td width='150px' style='font-size:30px;font-weight:bold;'> ONDA ".$wave."</td>";
$html_retorno .= "</tr>";
$html_retorno .= "</table>";


$html = "<html>";
$html .= "<head></head>";
$html .= "<body>";
$html .= $html_retorno;
$html .= "</body></html>";


$stylesheet = file_get_contents(site_url("/assets/stylesheets/pdf.css"));
$mpdf->WriteHTML($stylesheet,1);
$mpdf->WriteHTML($html);

// define um nome para o arquivo PDF
$filename = 'formulario_'.date("Y-m-d_his").'.pdf';

$mpdf->Output($filename, 'D');
die();
//$mpdf->Output();
}


public function xls($wave = '', $auditor_register = ''){
$this->authorize(array('auditor', 'coordinator'));
$current_user = $this->current_user();

$this->data['waves_list'] = $waves = $this->vacancy->waves();
$wave = empty($wave) ? $waves[0]['wave'] : $wave;
$auditor_register = $auditor_register ? $auditor_register : $current_user->register_id;


$this->data['wave'] = $wave;
$this->data['auditor_register'] = $auditor_register;
$this->data['open_vacancies'] = $this->vacancy->open_vacancies($auditor_register, $wave);
$this->data['close_vacancies'] = $this->vacancy->close_vacancies($auditor_register, $wave);


$this->layout = 'ajax';
$this->view = 'vacancies/vacancy.xls';

}






}