如何用PHP及MySQL建立多層導覽列
在寫多層導覽列時，會從資料庫撈出資料主要欄位有
cid,parent_id,name
以下是PHP代碼
//從TABLE撈出資料
$sql="SELECT * FROM net_class ORDER BY cid ASC";
$query=$db->query($sql);
while ($row_class=$db->fetch_array($query)) {
//放入陣列 $sm_class[]=array("cid"=>$row_class,"num"=>$row_class,"name"=>$row_class,"img"=>$row_class,"parent_id"=>$row_class);
}
function has_children($rows,$cid) {
foreach ($rows as $rowf) {
if ($rowf['parent_id'] == $cid)
return true;
}
return false;
}
function build_menu($rows,$parent=0)
{
$result = "<ul>";
foreach ($rows as $row)
{
if ($row['parent_id'] == $parent){
$result.= "<li>{$row}";
if (has_children($rows,$row['cid']))
$result.= build_menu($rows,$row['cid']);
$result.= "</li>";
}
}
$result.= "</ul>";
return $result;
}
echo build_menu($sm_class);
經過筆者實測，此種多重選單最為簡單明白
或是function buildTree(array $elements, $parentId = 0) {
$branch = array();
foreach ($elements as $element) {
if ($element['parent_id'] == $parentId) {
$children = buildTree($elements, $element['id']);
if ($children) {
$element['children'] = $children;
}
$branch[] = $element;
}
}
return $branch;
}
$tree = buildTree($rows);
參考文章
http://stackoverflow.com/questio ... sql-build-tree-menu
http://stackoverflow.com/questions/8587341/recursive-function-to-generate-multidimensional-array-from-database-result
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