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Dec 19, 2012 Replied to a topic by iloveyou › PHP › 算法苦逼，求一个最佳方案 |
不就是无限分类么，曾经看到过有人使用引用做的，大概是这个样子
<pre>
function get_tree($items)
{
$tree = array(); //格式化好的树
foreach ($items as $item)
if (isset($items[$item['parent_id']]))
$items[$item['parent_id']]['child'][] = &$items[$item['id']];
else
$tree[] = &$items[$item['id']];
return $tree;
}
$items = array(
1 => array('id'=>1, 'title'=>'title1', 'parent_id'=>0),
2 => array('id'=>2, 'title'=>'title2', 'parent_id'=>0),
3 => array('id'=>3, 'title'=>'title3', 'parent_id'=>1),
4 => array('id'=>4, 'title'=>'title4', 'parent_id'=>2)
);
echo json_encode(get_tree($items));
</pre>
<pre>
function get_tree($items)
{
$tree = array(); //格式化好的树
foreach ($items as $item)
if (isset($items[$item['parent_id']]))
$items[$item['parent_id']]['child'][] = &$items[$item['id']];
else
$tree[] = &$items[$item['id']];
return $tree;
}
$items = array(
1 => array('id'=>1, 'title'=>'title1', 'parent_id'=>0),
2 => array('id'=>2, 'title'=>'title2', 'parent_id'=>0),
3 => array('id'=>3, 'title'=>'title3', 'parent_id'=>1),
4 => array('id'=>4, 'title'=>'title4', 'parent_id'=>2)
);
echo json_encode(get_tree($items));
</pre>
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