public static function categoryParentSingleSelectCreate($categories) {

        // STEP 1: Initiatize the html select tag
        $html = "";
        $html .= '<select name="parent_id" id="parent_id" size="6" class="form-control" >';

        $html .= '<option ';
        $html .= 'value="';
        $html .= 0;
        $html .= '">';
        $html .= 'No Parent Category';
        $html .= '</option>"';

        // STEP 2: Construct the <option></option> categories for ALL categories in the categories table
        foreach ($categories as $category) {
            $html .= '<option ';
            $html .= 'value="';
            $html .= $category->id;
            $html .= '">';
            $html .= $category->title;
            $html .= '</option>"';
        }
        $html .= '</select>';

        $html .= self::renderBootstrapMultiselectPlugin(count($categories));

        return $html;
    }