Дано: массив получаемый из базы(неограниченной вложенности).

[php]array(10) {
  [0] => array(10) {
    ["id"] => string(2) "57"
    ["menu_id"] => string(2) "28"
    ["parent_id"] => string(1) "0"
    ["title"] => string(41) "Удостоверяющие центры"
    ["page_id"] => string(2) "11"
    ["link"] => string(0) ""
    ["position"] => string(1) "1"
    ["icon"] => string(0) ""
    ["addClass"] => string(11) "has-submenu"
    ["subitems"] => array(2) {
      [0] => array(9) {
        ["id"] => string(2) "61"
        ["menu_id"] => string(2) "28"
        ["parent_id"] => string(2) "57"
        ["title"] => string(25) "Получение ЭЦП"
        ["page_id"] => string(1) "0"
        ["link"] => string(0) ""
        ["position"] => string(1) "1"
        ["icon"] => string(0) ""
        ["addClass"] => string(10) "no-submenu"
      }
      [1] => array(9) {
        ["id"] => string(2) "62"
        ["menu_id"] => string(2) "28"
        ["parent_id"] => string(2) "57"
        ["title"] => string(35) "Работающие по ФЗ№94"
        ["page_id"] => string(1) "0"
        ["link"] => string(0) ""
        ["position"] => string(1) "2"
        ["icon"] => string(0) ""
        ["addClass"] => string(10) "no-submenu"
      }
    }
  }
  [1] => array(9) {
    ["id"] => string(2) "58"
    ["menu_id"] => string(2) "28"
    ["parent_id"] => string(1) "0"
    ["title"] => string(20) "Информация"
    ["page_id"] => string(2) "12"
    ["link"] => string(0) ""
    ["position"] => string(1) "2"
    ["icon"] => string(0) ""
    ["addClass"] => string(10) "no-submenu"
  }
  [2] => array(9) {
    ["id"] => string(2) "63"
    ["menu_id"] => string(2) "28"
    ["parent_id"] => string(1) "0"
    ["title"] => string(21) "Пресс центр"
    ["page_id"] => string(1) "0"
    ["link"] => string(0) ""
    ["position"] => string(1) "3"
    ["icon"] => string(0) ""
    ["addClass"] => string(10) "no-submenu"
  }
и т.д.
}[/php]

и вот такой код(тупой код который не работает. Но логика то правильная)

<ul>
                                    <?php foreach ($this->menu as $menuElement)?>
                                        <li>
                                            <a href="<?php echo $menuElement['link']?>"><?php echo $menuElement['title']?></a>
                                                <?php {if ($menuElement['addClass']='has-submenu')
                                                    $pid=$menuElement['parent_id'];
                                                        echo '<ul>', $ul=TRUE;
                                                            foreach ($this->menu as $childElement)
                                                                {if ($childElement['parent_id']=$pid)?> 
                                                            <li><a href="<?php 
                                                        echo $childElement['link']?>"> 
                                                    <?php echo $childElementElement['title']?></a></li>
                                                <?php {if ($ul) $ul=FALSE; echo "</ul>";} } }?> 
                                        </li>  
                                                     
                                </ul>

Вопрос "ЧТО Я ДЕЛАЮ НЕ ТАК?"