无限分级

方法

function list_to_tree($list, $pk = 'id', $pid = 'pid', $child = '_child', $root = 0)
{
// 创建Tree
    $tree = array();
    if (is_array($list)) {
// 创建基于主键的数组引用
        $refer = array();
        foreach ($list as $key => $data) {
            $refer[$data[$pk]] =& $list[$key];
        }
        foreach ($list as $key => $data) {
// 判断是否存在parent
            $parentId = $data[$pid];
            if ($root == $parentId) {
                $tree[] =& $list[$key];
            } else {
                if (isset($refer[$parentId])) {
                    $parent =& $refer[$parentId];
                    $parent[$child][] =& $list[$key];
                }
            }
        }
    }
    return $tree;
}
function list_sort_by($list, $field, $sortby = 'asc')
{
    if (is_array($list)) {
        $refer = $resultSet = array();
        foreach ($list as $i => $data)
            $refer[$i] = &$data[$field];
        switch ($sortby) {
            case 'asc': // 正向排序
                asort($refer);
                break;
            case 'desc':// 逆向排序
                arsort($refer);
                break;
            case 'nat': // 自然排序
                natcasesort($refer);
                break;
        }
        foreach ($refer as $key => $val)
            $resultSet[] = &$list[$key];
        return $resultSet;
    }
    return false;
}
function list_search($list, $condition)
{
    if (is_string($condition))
        parse_str($condition, $condition);
// 返回的结果集合
    $resultSet = array();
    foreach ($list as $key => $data) {
        $find = false;
        foreach ($condition as $field => $value) {
            if (isset($data[$field])) {
                if (0 === strpos($value, '/')) {
                    $find = preg_match($value, $data[$field]);
                } elseif ($data[$field] == $value) {
                    $find = true;
                }
            }
        }
        if ($find)
            $resultSet[] = &$list[$key];
    }
    return $resultSet;
}

使用

     $rules = M('rule')->order('sortid')->select();
     $list = list_to_tree($rules, 'id', 'pid');
     $this->assign('rules', $list);