我在构建多级选择框时遇到问题。我有结构的类别表:id,parent_id,名称。如果 parent_id = 0,则为顶级。我不知道级别深度,所以可能是 2,3-5 个级别。我如何使用查询"从猫中选择 * "构建它结果假设看起来像
<select>
<option>cat_name</option>
<option>--cat_name_l1</option>
<option>--cat_name_l1</option>
<option>----cat_name_l2</option>
<option>----cat_name_l2</option>
<option>cat_name</option>
</select>
你可以帮我吗?
function _buildTree($data, $idParent, $indentSymbol, $level)
{
$cat = array();
foreach($data as $row){
if($row['parent_id'] == $idParent){
if($indentSymbol AND $level > 0){
$symbols = array_fill(0, $level, $indentSymbol);
$cat[$row['id']] = implode('', $symbols) . $row['name'];
}else{
$cat[$row['id']] = $row['name'];
}
$cat = $cat + _buildTree($data, $row['id'], $indentSymbol, $level++);
}
}
return $cat;
}
$result = mysql_query("SELECT * FROM cats");
$data = array();
while($row = mysql_fetch_assoc($result)){
$data[] = $row;
}
$select = '<select>';
foreach(_buildTree($data, 0, '-', 0) as $key=>$option){
$select .= '<option value=' . $key . '>' . $option . '</option>';
}
$select .= '</select>';
尝试这样做来生成所需的下拉列表:
$result=mysql_query("SELECT * FROM cats");
$opt='<select>';
while($row=mysql_fetch_array($result))
{
$cat[$row['id']][0]=$row['parent_id'];
$cat[$row['id']][1]=$row['name'];
}
foreach($cat as $ct)
{
$level=0;
$temp=$ct;
while($temp[0]!=0)
{
$temp=$cat[$temp[0]];
$level++;
}
$opt.="<option>";
for($i=0;$i<$level;$i++)
{
$opt.="--";
}
$opt.=$ct[1];
$opt.="</option>";
}
$opt.="</select>";
然后,您可以将其用作:
echo $opt;