Html::displayNotFoundError PHP 메소드

    static function displayNotFoundError()
    {
        global $CFG_GLPI, $HEADER_LOADED;
        if (!$HEADER_LOADED) {
            if (!isset($_SESSION["glpiactiveprofile"]["interface"])) {
                self::nullHeader(__('Access denied'));
            } else {
                if ($_SESSION["glpiactiveprofile"]["interface"] == "central") {
                    self::header(__('Access denied'));
                } else {
                    if ($_SESSION["glpiactiveprofile"]["interface"] == "helpdesk") {
                        self::helpHeader(__('Access denied'));
                    }
                }
            }
        }
        echo "<div class='center'><br><br>";
        echo "<img src='" . $CFG_GLPI["root_doc"] . "/pics/warning.png' alt='" . __s('Warning') . "'>";
        echo "<br><br><span class='b'>" . __('Item not found') . "</span></div>";
        self::nullFooter();
        exit;
    }

 public function showForm($datas)
 {
     if (!isset($datas['id']) || !$this->getFromDB($datas['id'])) {
         Html::displayNotFoundError();
     }
     $form = new PluginFormcreatorForm();
     $form->getFromDB($this->fields['plugin_formcreator_forms_id']);
     echo '<form name="formcreator_form' . $form->getID() . '" method="post" role="form" enctype="multipart/form-data"
            action="' . $GLOBALS['CFG_GLPI']['root_doc'] . '/plugins/formcreator/front/formanswer.form.php"
            class="formcreator_form form_horizontal">';
     echo '<h1 class="form-title">' . $form->fields['name'] . '</h1>';
     // Form Header
     if (!empty($form->fields['content'])) {
         echo '<div class="form_header">';
         echo html_entity_decode($form->fields['content']);
         echo '</div>';
     }
     if ($this->fields['status'] == 'refused') {
         echo '<div class="refused_header">';
         echo '<div>' . nl2br($this->fields['comment']) . '</div>';
         echo '</div>';
     } elseif ($this->fields['status'] == 'accepted') {
         echo '<div class="accepted_header">';
         echo '<div>';
         if (!empty($this->fields['comment'])) {
             echo nl2br($this->fields['comment']);
         } elseif ($form->fields['validation_required']) {
             echo __('Form accepted by validator.', 'formcreator');
         } else {
             echo __('Form successfully saved.', 'formcreator');
         }
         echo '</div>';
         echo '</div>';
     }
     // Get and display sections of the form
     $question = new PluginFormcreatorQuestion();
     $questions = array();
     $section_class = new PluginFormcreatorSection();
     $find_sections = $section_class->find('plugin_formcreator_forms_id = ' . $form->getID(), '`order` ASC');
     echo '<div class="form_section">';
     foreach ($find_sections as $section_line) {
         echo '<h2>' . $section_line['name'] . '</h2>';
         // Display all fields of the section
         $questions = $question->find('plugin_formcreator_sections_id = ' . $section_line['id'], '`order` ASC');
         foreach ($questions as $question_line) {
             $answer = new PluginFormcreatorAnswer();
             $found = $answer->find('plugin_formcreator_formanwers_id = "' . $this->getID() . '"
                         AND plugin_formcreator_question_id = "' . $question_line['id'] . '"');
             $found = array_shift($found);
             // if (in_array($question_line['fieldtype'], array('checkboxes', 'multiselect'))) {
             //    $found['answer'] = json_decode($found['answer']);
             // }
             $canEdit = $this->fields['status'] == 'refused' && $_SESSION['glpiID'] == $this->fields['requester_id'];
             if ($canEdit || $question_line['fieldtype'] != "description" && $question_line['fieldtype'] != "hidden") {
                 PluginFormcreatorFields::showField($question_line, $found['answer'], $canEdit);
             }
         }
     }
     echo '<script type="text/javascript">formcreatorShowFields();</script>';
     // Display submit button
     if ($this->fields['status'] == 'refused' && $_SESSION['glpiID'] == $this->fields['requester_id']) {
         echo '<div class="form-group line' . (count($questions) + 1) % 2 . '">';
         echo '<div class="center">';
         echo '<input type="submit" name="save_formanswer" class="submit_button" value="' . __('Save') . '" />';
         echo '</div>';
         echo '</div>';
         // Display validation form
     } elseif ($this->fields['status'] == 'waiting' && $_SESSION['glpiID'] == $this->fields['validator_id']) {
         if (Session::haveRight('ticketvalidation', TicketValidation::VALIDATEINCIDENT) || Session::haveRight('ticketvalidation', TicketValidation::VALIDATEREQUEST)) {
             echo '<div class="form-group required line' . (count($questions) + 1) % 2 . '">';
             echo '<label for="comment">' . __('Comment', 'formcreator') . ' <span class="red">*</span></label>';
             echo '<textarea class="form-control"
                  rows="5"
                  name="comment"
                  id="comment">' . $this->fields['comment'] . '</textarea>';
             echo '<div class="help-block">' . __('Required if refused', 'formcreator') . '</div>';
             echo '</div>';
             echo '<div class="form-group line' . count($questions) % 2 . '">';
             echo '<div class="center" style="float: left; width: 50%;">';
             echo '<input type="submit" name="refuse_formanswer" class="submit_button"
                  value="' . __('Refuse', 'formcreator') . '" onclick="return checkComment(this);" />';
             echo '</div>';
             echo '<div class="center">';
             echo '<input type="submit" name="accept_formanswer" class="submit_button" value="' . __('Accept', 'formcreator') . '" />';
             echo '</div>';
             echo '</div>';
         }
     }
     echo '<input type="hidden" name="formcreator_form" value="' . $form->getID() . '">';
     echo '<input type="hidden" name="id" value="' . $this->getID() . '">';
     echo '<input type="hidden" name="_glpi_csrf_token" value="' . Session::getNewCSRFToken() . '">';
     echo '</div>';
     echo '</form>';
     echo '<script type="text/javascript">
            function checkComment(field) {
               if (document.getElementById("comment").value == "") {
                  alert("' . __('Refused comment is required!', 'formcreator') . '");
                  return false;
               }
            }
         </script>';
 }