PHP - 递归无限级分类下的所有子集

 $value)
    {
        if($value['parent_id' ] == $parent_id)
        {
            $value[ 'level'] = $level;
            $arrTree[] = $value;
            unset($arrCat[$key]); //注销当前节点数据，减少已无用的遍历
            getMenuTree($arrCat, $value[ 'id'], $level);
        }
    }
    return $arrTree;
}
/**
 * 测试数据
 */
$arrCate = array(  //待排序数组
    array( 'id'=>1, 'name' =>'顶级栏目一', 'parent_id'=>0),
    array( 'id'=>2, 'name' =>'顶级栏目二', 'parent_id'=>0),
    array( 'id'=>3, 'name' =>'栏目三', 'parent_id'=>1),
    array( 'id'=>4, 'name' =>'栏目四', 'parent_id'=>3),
    array( 'id'=>5, 'name' =>'栏目五', 'parent_id'=>4),
    array( 'id'=>6, 'name' =>'栏目六', 'parent_id'=>2)
);
header('Content-type:text/html; charset=utf-8'); //设置utf-8编码
echo '
';
print_r(getMenuTree($arrCate, 0, 0));
echo '
';
?>

结果

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => 顶级栏目一
            [parent_id] => 0
            [level] => 1
        )
    [1] => Array
        (
            [id] => 3
            [name] => 栏目三
            [parent_id] => 1
            [level] => 2
        )
    [2] => Array
        (
            [id] => 4
            [name] => 栏目四
            [parent_id] => 3
            [level] => 3
        )
    [3] => Array
        (
            [id] => 5
            [name] => 栏目五
            [parent_id] => 4
            [level] => 4
        )
    [4] => Array
        (
            [id] => 2
            [name] => 顶级栏目二
            [parent_id] => 0
            [level] => 1
        )
    [5] => Array
        (
            [id] => 6
            [name] => 栏目六
            [parent_id] => 2
            [level] => 2
        )
)