我有一个类别表PHP的递归函数不能正常工作
(ID = 1,名称=手工制作的,父= 0)
(ID = 2,名称=工厂制,父= 0)
(ID = 3,名字=椅子,父= 1)
(ID = 4,名称= tabels,父= 1)
(ID = 5,名字=旧椅子,父= 3)
在如果访问者点击类别旧椅子菜单,会去页
products.php?CATEGORY_ID = 5
然后在这个页面,我需要知道什么是主CATEGORY_ID,这应该是手与CATEGORY_ID MADE = 1
所以在这个页面我想说
if isset($_REQUEST['category_id']){
do the function till find the main parent,
$mainparentid = main parent category_id
}else { $mainparentid = '';
} echo $mainparentid;
这是我的PHP代码
if (isset($_REQUEST['category_id'])) {
function getParent($id) {
global $connection;
$query_rsCategoryId = "SELECT * FROM categories
WHERE category_id = '".$_REQUEST['category_id']."'";
$rsCategoryId = mysql_query($query_rsCategoryId, $connection);
$row_rsCategoryId = mysql_fetch_assoc($rsCategoryId);
$parent = $row_rsCategoryId['category_parent'];
if (mysql_num_rows($rsCategoryId) < 1) {
// Error handling, entry with id $id not found
return null;
}
if ($parent == 0) {
return $id;
} else {
return getParent($parent);
}
}
$mainparentid = getParent($id);
}else {
$mainparentid ='none';
}
echo $mainparentid ;