Multiple file upload in CodeIgniter 3

ci3-multiple-upload.php

<?php

        $count = count($_FILES['files']['name']);
        
        $successes = [];
        $errors = [];
        for ($i = 0; $i < $count; $i++) {
            $_FILES['file']['name'] = $_FILES['files']['name'][$i];
            $_FILES['file']['type'] = $_FILES['files']['type'][$i];
            $_FILES['file']['tmp_name'] = $_FILES['files']['tmp_name'][$i];
            $_FILES['file']['error'] = $_FILES['files']['error'][$i];
            $_FILES['file']['size'] = $_FILES['files']['size'][$i];
            $config['upload_path'] = 'your/upload/path'; 
            $config['remove_spaces'] = FALSE;
            $config['allowed_types'] = 'pdf';
            $config['max_size'] = 5120;
    
            $this->load->library('upload',$config); 
        
            if ($this->upload->do_upload('file')){
                $filename = $this->upload->data('file_name');
                // handle your file
            } else {
                $errors[] = [
                    'filename' => $_FILES['file']['name'],
                    'error' => $this->upload->display_errors('', '')
                ];
            }
        }

        // ...