PMA\libraries\config\FormDisplay::_displayFieldInput PHP Method

    private function _displayFieldInput(Form $form, $field, $system_path, $work_path, $translated_path, $show_restore_default, $userprefs_allow, array &$js_default)
    {
        $name = PMA_langName($system_path);
        $description = PMA_langName($system_path, 'desc', '');
        $value = $this->_configFile->get($work_path);
        $value_default = $this->_configFile->getDefault($system_path);
        $value_is_default = false;
        if ($value === null || $value === $value_default) {
            $value = $value_default;
            $value_is_default = true;
        }
        $opts = array('doc' => $this->getDocLink($system_path), 'show_restore_default' => $show_restore_default, 'userprefs_allow' => $userprefs_allow, 'userprefs_comment' => PMA_langName($system_path, 'cmt', ''));
        if (isset($form->default[$system_path])) {
            $opts['setvalue'] = $form->default[$system_path];
        }
        if (isset($this->_errors[$work_path])) {
            $opts['errors'] = $this->_errors[$work_path];
        }
        $type = '';
        switch ($form->getOptionType($field)) {
            case 'string':
                $type = 'text';
                break;
            case 'short_string':
                $type = 'short_text';
                break;
            case 'double':
            case 'integer':
                $type = 'number_text';
                break;
            case 'boolean':
                $type = 'checkbox';
                break;
            case 'select':
                $type = 'select';
                $opts['values'] = $form->getOptionValueList($form->fields[$field]);
                break;
            case 'array':
                $type = 'list';
                $value = (array) $value;
                $value_default = (array) $value_default;
                break;
            case 'group':
                // :group:end is changed to :group:end:{unique id} in Form class
                $htmlOutput = '';
                if (mb_substr($field, 7, 4) != 'end:') {
                    $htmlOutput .= PMA_displayGroupHeader(mb_substr($field, 7));
                } else {
                    PMA_displayGroupFooter();
                }
                return $htmlOutput;
            case 'NULL':
                trigger_error("Field {$system_path} has no type", E_USER_WARNING);
                return null;
        }
        // detect password fields
        if ($type === 'text' && (mb_substr($translated_path, -9) === '-password' || mb_substr($translated_path, -4) === 'pass' || mb_substr($translated_path, -4) === 'Pass')) {
            $type = 'password';
        }
        // TrustedProxies requires changes before displaying
        if ($system_path == 'TrustedProxies') {
            foreach ($value as $ip => &$v) {
                if (!preg_match('/^-\\d+$/', $ip)) {
                    $v = $ip . ': ' . $v;
                }
            }
        }
        $this->_setComments($system_path, $opts);
        // send default value to form's JS
        $js_line = '\'' . $translated_path . '\': ';
        switch ($type) {
            case 'text':
            case 'short_text':
            case 'number_text':
            case 'password':
                $js_line .= '\'' . Sanitize::escapeJsString($value_default) . '\'';
                break;
            case 'checkbox':
                $js_line .= $value_default ? 'true' : 'false';
                break;
            case 'select':
                $value_default_js = is_bool($value_default) ? (int) $value_default : $value_default;
                $js_line .= '[\'' . Sanitize::escapeJsString($value_default_js) . '\']';
                break;
            case 'list':
                $js_line .= '\'' . Sanitize::escapeJsString(implode("\n", $value_default)) . '\'';
                break;
        }
        $js_default[] = $js_line;
        return PMA_displayInput($translated_path, $name, $type, $value, $description, $value_is_default, $opts);
    }