สอบถามเรื่อง jQuery File Upload ไม่สามารถลบไฟล์ได้ค่ะ

protected function set_additional_file_properties($file) {
        $file->deleteUrl = $this->options['script_url']
            .$this->get_query_separator($this->options['script_url'])
            .$this->get_singular_param_name()
            .'='.rawurlencode($file->name);
        $file->deleteType = $this->options['delete_type'];
        if ($file->deleteType !== 'DELETE') {
            $file->deleteUrl .= '&_method=DELETE';
        }
        if ($this->options['access_control_allow_credentials']) {
            $file->deleteWithCredentials = true;
        }
    }

public function post($print_response = true) {
        if (isset($_REQUEST['_method']) && $_REQUEST['_method'] === 'DELETE') {
            return $this->delete($print_response);
        }

public function delete($print_response = true) {
        $file_names = $this->get_file_names_params();
        if (empty($file_names)) {
            $file_names = array($this->get_file_name_param());
        }
        $response = array();
        foreach($file_names as $file_name) {
            $file_path = $this->get_upload_path($file_name);
            $success = is_file($file_path) && $file_name[0] !== '.' && unlink($file_path);
            if ($success) {
                foreach($this->options['image_versions'] as $version => $options) {
                    if (!empty($version)) {
                        $file = $this->get_upload_path($file_name, $version);
                        if (is_file($file)) {
                            unlink($file);
                        }
                    }
                }
            }
            $response[$file_name] = $success;
        }
        return $this->generate_response($response, $print_response);
    }