Question

我有sql结构

id parent_id
1     0
2     1
3     2
4     3
5     4
6     5
7     1
8     7
9     8

我想使用php

调用id = 1的所有子子节点到第n个子节点

我怎样才能得到它。我是使用php回调函数构建的。

Answer 1

通过使用递归，你可以......

<?php
$arrayParent = $this->ToDatabase->("SELECT * FROM table WHERE parent_id = 0");
BuildList($arrayParent, 0);

function BuildList($arrayElements, $depth)
{
    foreach($arrayElements as $element)
    {
        echo str_repeat("&nbsp;&nbsp;", $depth) . $element["id"];
        $depth++;
        $totalUnder = $this->ToDatabase->("SELECT * FROM table 
                        WHERE parent_id = " . (int)$element["id"]);
        if(count($totalUnder) > 0)
            $depth = BuildList($totalUnder, $depth); //$totalUnder fetch to array and step deeper...

        return $depth;
    }
}
?>

父母子女关系直到第n个孩子

1 个答案: