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php 无限分类 树形数据格式化代码

一佰互联网站制作(www.yinxi.net) 发布日期 2019-04-26 09:03:50 浏览数: 101

我们知道很多开源软件的无限分类都是采用递归的算法,但是我们知道递归即浪费时间,又浪费空间(内存),
上次我也分享了个我自己原创的无限分类生成树的方法,一热心php高手网友给我提出了宝贵的建议,我测试了一下,这段代码的时间非常之短参考: http://www.oschina.net/code/snippet_98719_11296,我再次整理了一下,发现数据库查询出数据之后,我们就已经定好了键值,因而实践中,我们一般会在model中查询出格式化成主键值对应数据的形式,因而我们可以直接用这样的数据,就少了一层循环。代码也非常简洁。

原来的代码:

function genTree($items,$id="id",$pid="pid",$son = "children"){
  $tree = array(); //格式化的树
  $tmpMap = array(); //临时扁平数据
   
  foreach ($items as $item) {
    $tmpMap[$item[$id]] = $item;
  }
   
  foreach ($items as $item) {
    if (isset($tmpMap[$item[$pid]])) {
      $tmpMap[$item[$pid]][$son][] = &$tmpMap[$item[$id]];
    } else {
      $tree[] = &$tmpMap[$item[$id]];
    }
  }
  unset($tmpMap);
  return $tree;
}
 
$items1 = array(
    array("id" => 1, "pid" => 0, "name" => "一级11" ),
    array("id" => 11, "pid" => 0, "name" => "一级12" ),
    array("id" => 2, "pid" => 1, "name" => "二级21" ),
    array("id" => 10, "pid" => 11, "name" => "二级22" ),
    array("id" => 3, "pid" => 1, "name" => "二级23" ),
    array("id" => 12, "pid" => 11, "name" => "二级24" ),
    array("id" => 9, "pid" => 1, "name" => "二级25" ),
    array("id" => 14, "pid" => 1, "name" => "二级26" ),
    array("id" => 4, "pid" => 9, "name" => "三级31" ),
    array("id" => 6, "pid" => 9, "name" => "三级32" ),
    array("id" => 7, "pid" => 4, "name" => "四级41" ),
    array("id" => 8, "pid" => 4, "name" => "四级42" ),
    array("id" => 5, "pid" => 4, "name" => "四级43" ),
    array("id" => 13, "pid" => 4, "name" => "四级44" ),
    array("id" => 15, "pid" => 8, "name" => "五级51" ),
    array("id" => 16, "pid" => 8, "name" => "五级52" ),
    array("id" => 17, "pid" => 8, "name" => "五级53" ),
    array("id" => 18, "pid" => 16, "name" => "六级64" ),
); 
var_dump(genTree($items1));

以下是补充:

/**
 * 此方法由@Tonton 提供
 * http://my.oschina.net/u/918697
 * @date 2012-12-12
 */
function genTree5($items) {
  foreach ($items as $item)
    $items[$item["pid"]]["son"][$item["id"]] = &$items[$item["id"]];
  return isset($items[0]["son"]) ? $items[0]["son"] : array();
}
/**
 * 将数据格式化成树形结构
 * @author Xuefen.Tong
 * @param array $items
 * @return array
 */
function genTree9($items) {
  $tree = array(); //格式化好的树
  foreach ($items as $item)
    if (isset($items[$item["pid"]]))
      $items[$item["pid"]]["son"][] = &$items[$item["id"]];
    else
      $tree[] = &$items[$item["id"]];
  return $tree;
}
 
$items = array(
  1 => array("id" => 1, "pid" => 0, "name" => "江西省"),
  2 => array("id" => 2, "pid" => 0, "name" => "黑龙江省"),
  3 => array("id" => 3, "pid" => 1, "name" => "南昌市"),
  4 => array("id" => 4, "pid" => 2, "name" => "哈尔滨市"),
  5 => array("id" => 5, "pid" => 2, "name" => "鸡西市"),
  6 => array("id" => 6, "pid" => 4, "name" => "香坊区"),
  7 => array("id" => 7, "pid" => 4, "name" => "南岗区"),
  8 => array("id" => 8, "pid" => 6, "name" => "和兴路"),
  9 => array("id" => 9, "pid" => 7, "name" => "西大直街"),
  10 => array("id" => 10, "pid" => 8, "name" => "东北林业大学"),
  11 => array("id" => 11, "pid" => 9, "name" => "哈尔滨工业大学"),
  12 => array("id" => 12, "pid" => 8, "name" => "哈尔滨师范大学"),
  13 => array("id" => 13, "pid" => 1, "name" => "赣州市"),
  14 => array("id" => 14, "pid" => 13, "name" => "赣县"),
  15 => array("id" => 15, "pid" => 13, "name" => "于都县"),
  16 => array("id" => 16, "pid" => 14, "name" => "茅店镇"),
  17 => array("id" => 17, "pid" => 14, "name" => "大田乡"),
  18 => array("id" => 18, "pid" => 16, "name" => "义源村"),
  19 => array("id" => 19, "pid" => 16, "name" => "上坝村"),
);

print_r(genTree5($items));
print_r(genTree9($items));
//后者输出格式,前者类似,只是数组键值不一样,不过不影响数据结构

/*
Array
(
[0] => Array
  (
    [id] => 1
    [pid] => 0
    [name] => 江西省
    [son] => Array
      (
        [0] => Array
          (
            [id] => 3
            [pid] => 1
            [name] => 南昌市
          )
 
        [1] => Array
          (
            [id] => 13
            [pid] => 1
            [name] => 赣州市
            [son] => Array
              (
                [0] => Array
                  (
                    [id] => 14
                    [pid] => 13
                    [name] => 赣县
                    [son] => Array
                      (
                      [0] => Array
                        (
                          [id] => 16
                          [pid] => 14
                          [name] => 茅店镇
                          [son] => Array
                            (
                            [0] => Array
                              (
                              [id] => 18
                              [pid] => 16
                              [name] => 义源村
                              )
 
                            [1] => Array
                              (
                              [id] => 19
                              [pid] => 16
                              [name] => 上坝村
                              )
 
                            )
 
                        )
 
                      [1] => Array
                        (
                          [id] => 17
                          [pid] => 14
                          [name] => 大田乡
                        )
 
                      )
 
                  )
 
                [1] => Array
                  (
                    [id] => 15
                    [pid] => 13
                    [name] => 于都县
                  )
 
              )
 
          )
 
      )
 
  )
 
[1] => Array
  (
    [id] => 2
    [pid] => 0
    [name] => 黑龙江省
    [son] => Array
      (
        [0] => Array
          (
            [id] => 4
            [pid] => 2
            [name] => 哈尔滨市
            [son] => Array
              (
              [0] => Array
                (
                  [id] => 6
                  [pid] => 4
                  [name] => 香坊区
                  [son] => Array
                    (
                    [0] => Array
                      (
                        [id] => 8
                        [pid] => 6
                        [name] => 和兴路
                        [son] => Array
                          (
                            [0] => Array
                              (
                              [id] => 10
                              [pid] => 8
                              [name] =>
                               东北林业大学
                              )
 
                            [1] => Array
                              (
                              [id] => 12
                              [pid] => 8
                              [name] =>
                              哈尔滨师范大学
                              )
 
                          )
 
                      )
 
                    )
 
                )
 
              [1] => Array
                (
                  [id] => 7
                  [pid] => 4
                  [name] => 南岗区
                  [son] => Array
                    (
                    [0] => Array
                      (
                      [id] => 9
                      [pid] => 7
                      [name] => 西大直街
                      [son] => Array
                        (
                        [0] => Array
                          (
                          [id] => 11
                          [pid] => 9
                          [name] =>
                           哈尔滨工业大学
                          )
 
                        )
 
                      )
 
                    )
 
                )
 
              )
 
          )
 
        [1] => Array
          (
            [id] => 5
            [pid] => 2
            [name] => 鸡西市
          )
 
      )
 
  )
)*/

极其简单有效!!!非常受用!

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