如何从该结果集中创建一个数组嵌套的类别存储在遍历模型中的数据库中？

如何解决如何从该结果集中创建一个数组嵌套的类别存储在遍历模型中的数据库中？

啊，最后有一些参考文献很方便：

<?PHP
$tree = array(
    array('Cat 1', 'depth' => 0),
    array('Cat 2', 'depth' => 1),
    array('Cat 3', 'depth' => 1),
    array('Cat 4', 'depth' => 2),
    array('Cat 5', 'depth' => 1),
    array('Cat 6', 'depth' => 2),
    array('Cat 7', 'depth' => 3),
    array('Cat 8', 'depth' => 1)
);
//same as before
$currDepth = -1;

//initilialize result
$result = array();

//create path structure for depths
$path = array();

//create 'root' node
$olditem = array('children'=> &$result);


foreach($tree as $item){
    if($item['depth'] > $currDepth){
        //remove possible old reference (old depth of other branch
        if(isset($path[$item['depth']])) unset($path[$item['depth']]);

        //make sure we have an array entry
        if(!isset($olditem['children'])) $olditem['children'] = array();

        //acquire target
        $path[$item['depth']] = &$olditem['children'];
    }
    if($item['depth'] != $currDepth) unset($olditem);
    //set correct target
    $currDepth = $item['depth'];
    //add item
    $path[$currDepth][] = &$item;
    //copy & remove reference
    $olditem = &$item;
    unset($item);
}
//always nice to clean up reference bombs:
unset($path);
unset($olditem);

var_dump($result);
?>

解决方法

逻辑波纹管用于构建有序列表，但是如何对数组执行相同操作？

我想建立一个嵌套数组。

// bootstrap loop
$result = '';
$currDepth = -1;  // -1 to get the outer <ul>
while (!empty($tree)) {
  $currNode = array_shift($tree);
  // Level down?
  if ($currNode['depth'] > $currDepth) {
    // Yes,open <ul>
    $result .= '<ul>';
  }
  // Level up?
  if ($currNode['depth'] < $currDepth) {
    // Yes,close n open <ul>
    $result .= str_repeat('</ul>',$currDepth - $currNode['depth']);
  }
  // Always add node
  $result .= '<li>' . $currNode['title'] . '</li>';
  // Adjust current depth
  $currDepth = $currNode['depth'];
  // Are we finished?
  if (empty($tree)) {
    // Yes,$currDepth + 1);
  }
}

print $result;