与PHP MYSQL和foreach语句

Question

我的代码和表格多级菜单的工作给出如下

TABLES

menu 
    ==== 
    m_id menu_name parent_menu_id menu_order menu_url status 
    1  M1   0    1   #   1 
    2  M2   0    2   #   1 
    3  S1   1    1   #   1 
    4  S2   1    2   #   1 

    user_rights 
    ===========  
    user_id   rights 
    1    1,2,3,4 
    2    1,2,3 

CODE

<?php 
    $get_user_id = "1"; // user id will be 1 or 2 or any id from user table 
    mysql_connect("localhost", "root", "password") or die(mysql_error()); 
    mysql_select_db("booksdb") or die(mysql_error()); 

    function getMenuRights($get_user_id) { 
    $get_user_id = intval($get_user_id); 
    $get_access_query = mysql_query("SELECT access FROM user_rights where user_id='".$get_user_id."'"); 
    $fetch_access_list = mysql_fetch_row($get_access_query); 
    $get_access_list = $fetch_access_list[0]; 
    return $get_access_list; 
    } 

    function getUserMainMenus($get_user_id) { 
    $get_user_id = intval($get_user_id); 
    $rights = getMenuRights($get_user_id); 
    $get_main_menu_query = mysql_query("SELECT * FROM menu where m_id IN ($rights) and parent_menu_id='0' order by menu_order"); 
    while ($row = mysql_fetch_assoc($get_main_menu_query)) { 
    $results[] = $row; 
    } 
    return $results; 
    } 

    function getUserChildMenu($parent_menu_id, $get_user_id) { 
    $parent_menu_id = intval($parent_menu_id); 
    $get_user_id = intval($get_user_id); 
    $rights = getMenuRights($get_user_id); 
    $get_sub_menu = mysql_query("SELECT * FROM menu where parent_menu_id='".$parent_menu_id."' AND m_id IN ($rights)"); 
    while($row = mysql_fetch_assoc($get_sub_menu)) { 
    $results[] = $row; 
    } 
    return $results; 
    } 

    ?> 
    <div id='cssmenu'> 
    <ul> 
    <?php foreach (getUserMainMenus($get_user_id) as $get_main_menu): ?> 
    <li class='has-sub'><a href='#'><span><?=$get_main_menu['menu_name']; ?></span></a> 
    <ul> 
    <?php foreach (getUserChildMenu($get_main_menu['m_id'], $get_user_id) as $sub_menu): ?> 
    <li class='has-sub'><a href='<?=$sub_menu['menu_url']; ?>'><span><?=$sub_menu['menu_name']; ?></span></a> 
    </li> 
    <?php endforeach; ?> 
    </ul> 
    </li> 
    <?php endforeach; ?> 
    </ul> 
    </div> 

上面的代码工作正常，但它显示了一些错误。

Undefined variable: results in phpfilename.php on line 21(and 32) 

此外，我必须检查每个菜单和子菜单之前是否有值，然后显示子菜单。

我怎么能这样做？

换句话说，在我的菜单和子菜单开始之前，我需要检查值然后显示。如果有值，则显示子菜单。如果没有单独显示主菜单。

任何帮助。

感谢， Kimz

Answer 1

您试图追加到变量$results排列为尚未开始。

添加以下内容：

$results = array(); 

上面的每个：

while() { ... } 

---

例如：

function getUserMainMenus($get_user_id) { 
    $get_user_id = intval($get_user_id); 
    $rights = getMenuRights($get_user_id); 
    $get_main_menu_query = mysql_query("SELECT * FROM menu where m_id IN ($rights) and parent_menu_id='0' order by menu_order"); 
    $results = array(); // add this here 
    while ($row = mysql_fetch_assoc($get_main_menu_query)) { 
    $results[] = $row; 
    } 
    return $results; 
    }