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php 無(wú)限分類 樹形數(shù)據(jù)格式化代碼

 更新時(shí)間：2016年10月11日 16:07:59   投稿：mdxy-dxy  
這篇文章主要介紹了php 無(wú)限分類 樹形數(shù)據(jù)格式化代碼,需要的朋友可以參考下

我們知道很多開(kāi)源軟件的無(wú)限分類都是采用遞歸的算法，但是我們知道遞歸即浪費(fèi)時(shí)間，又浪費(fèi)空間（內(nèi)存），
上次我也分享了個(gè)我自己原創(chuàng)的無(wú)限分類生成樹的方法，一熱心php高手網(wǎng)友給我提出了寶貴的建議，我測(cè)試了一下，這段代碼的時(shí)間非常之短參考： http://www.oschina.net/code/snippet_98719_11296，我再次整理了一下，發(fā)現(xiàn)數(shù)據(jù)庫(kù)查詢出數(shù)據(jù)之后，我們就已經(jīng)定好了鍵值，因而實(shí)踐中，我們一般會(huì)在model中查詢出格式化成主鍵值對(duì)應(yīng)數(shù)據(jù)的形式，因而我們可以直接用這樣的數(shù)據(jù)，就少了一層循環(huán)。代碼也非常簡(jiǎn)潔。

原來(lái)的代碼：

function genTree($items,$id='id',$pid='pid',$son = 'children'){
  $tree = array(); //格式化的樹
  $tmpMap = array(); //臨時(shí)扁平數(shù)據(jù)
   
  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;
}
 
$items1 = array(
    array('id' => 1, 'pid' => 0, 'name' => '一級(jí)11' ),
    array('id' => 11, 'pid' => 0, 'name' => '一級(jí)12' ),
    array('id' => 2, 'pid' => 1, 'name' => '二級(jí)21' ),
    array('id' => 10, 'pid' => 11, 'name' => '二級(jí)22' ),
    array('id' => 3, 'pid' => 1, 'name' => '二級(jí)23' ),
    array('id' => 12, 'pid' => 11, 'name' => '二級(jí)24' ),
    array('id' => 9, 'pid' => 1, 'name' => '二級(jí)25' ),
    array('id' => 14, 'pid' => 1, 'name' => '二級(jí)26' ),
    array('id' => 4, 'pid' => 9, 'name' => '三級(jí)31' ),
    array('id' => 6, 'pid' => 9, 'name' => '三級(jí)32' ),
    array('id' => 7, 'pid' => 4, 'name' => '四級(jí)41' ),
    array('id' => 8, 'pid' => 4, 'name' => '四級(jí)42' ),
    array('id' => 5, 'pid' => 4, 'name' => '四級(jí)43' ),
    array('id' => 13, 'pid' => 4, 'name' => '四級(jí)44' ),
    array('id' => 15, 'pid' => 8, 'name' => '五級(jí)51' ),
    array('id' => 16, 'pid' => 8, 'name' => '五級(jí)52' ),
    array('id' => 17, 'pid' => 8, 'name' => '五級(jí)53' ),
    array('id' => 18, 'pid' => 16, 'name' => '六級(jí)64' ),
); 
var_dump(genTree($items1));

以下是補(bǔ)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();
}
/**
 * 將數(shù)據(jù)格式化成樹形結(jié)構(gòu)
 * @author Xuefen.Tong
 * @param array $items
 * @return array
 */
function genTree9($items) {
  $tree = array(); //格式化好的樹
  foreach ($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' => '黑龍江省'),
  3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),
  4 => array('id' => 4, 'pid' => 2, 'name' => '哈爾濱市'),
  5 => array('id' => 5, 'pid' => 2, 'name' => '雞西市'),
  6 => array('id' => 6, 'pid' => 4, 'name' => '香坊區(qū)'),
  7 => array('id' => 7, 'pid' => 4, 'name' => '南崗區(qū)'),
  8 => array('id' => 8, 'pid' => 6, 'name' => '和興路'),
  9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),
  10 => array('id' => 10, 'pid' => 8, 'name' => '東北林業(yè)大學(xué)'),
  11 => array('id' => 11, 'pid' => 9, 'name' => '哈爾濱工業(yè)大學(xué)'),
  12 => array('id' => 12, 'pid' => 8, 'name' => '哈爾濱師范大學(xué)'),
  13 => array('id' => 13, 'pid' => 1, 'name' => '贛州市'),
  14 => array('id' => 14, 'pid' => 13, 'name' => '贛縣'),
  15 => array('id' => 15, 'pid' => 13, 'name' => '于都縣'),
  16 => array('id' => 16, 'pid' => 14, 'name' => '茅店鎮(zhèn)'),
  17 => array('id' => 17, 'pid' => 14, 'name' => '大田鄉(xiāng)'),
  18 => array('id' => 18, 'pid' => 16, 'name' => '義源村'),
  19 => array('id' => 19, 'pid' => 16, 'name' => '上壩村'),
);

print_r(genTree5($items));
print_r(genTree9($items));
//后者輸出格式，前者類似，只是數(shù)組鍵值不一樣，不過(guò)不影響數(shù)據(jù)結(jié)構(gòu)

/*
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] => 贛州市
            [son] => Array
              (
                [0] => Array
                  (
                    [id] => 14
                    [pid] => 13
                    [name] => 贛縣
                    [son] => Array
                      (
                      [0] => Array
                        (
                          [id] => 16
                          [pid] => 14
                          [name] => 茅店鎮(zhèn)
                          [son] => Array
                            (
                            [0] => Array
                              (
                              [id] => 18
                              [pid] => 16
                              [name] => 義源村
                              )
 
                            [1] => Array
                              (
                              [id] => 19
                              [pid] => 16
                              [name] => 上壩村
                              )
 
                            )
 
                        )
 
                      [1] => Array
                        (
                          [id] => 17
                          [pid] => 14
                          [name] => 大田鄉(xiāng)
                        )
 
                      )
 
                  )
 
                [1] => Array
                  (
                    [id] => 15
                    [pid] => 13
                    [name] => 于都縣
                  )
 
              )
 
          )
 
      )
 
  )
 
[1] => Array
  (
    [id] => 2
    [pid] => 0
    [name] => 黑龍江省
    [son] => Array
      (
        [0] => Array
          (
            [id] => 4
            [pid] => 2
            [name] => 哈爾濱市
            [son] => Array
              (
              [0] => Array
                (
                  [id] => 6
                  [pid] => 4
                  [name] => 香坊區(qū)
                  [son] => Array
                    (
                    [0] => Array
                      (
                        [id] => 8
                        [pid] => 6
                        [name] => 和興路
                        [son] => Array
                          (
                            [0] => Array
                              (
                              [id] => 10
                              [pid] => 8
                              [name] =>
                               東北林業(yè)大學(xué)
                              )
 
                            [1] => Array
                              (
                              [id] => 12
                              [pid] => 8
                              [name] =>
                              哈爾濱師范大學(xué)
                              )
 
                          )
 
                      )
 
                    )
 
                )
 
              [1] => Array
                (
                  [id] => 7
                  [pid] => 4
                  [name] => 南崗區(qū)
                  [son] => Array
                    (
                    [0] => Array
                      (
                      [id] => 9
                      [pid] => 7
                      [name] => 西大直街
                      [son] => Array
                        (
                        [0] => Array
                          (
                          [id] => 11
                          [pid] => 9
                          [name] =>
                           哈爾濱工業(yè)大學(xué)
                          )
 
                        )
 
                      )
 
                    )
 
                )
 
              )
 
          )
 
        [1] => Array
          (
            [id] => 5
            [pid] => 2
            [name] => 雞西市
          )
 
      )
 
  )
)*/

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