php无限分类树形数据格式化代码实例详解

这篇文章主要介绍了php 无限分类 树形数据格式化代码,需要的朋友可以参考下

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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