php生成无限栏目树_php技巧

栏目数组:

$arr=Array(
  Array('cid' => 2,'cname' => '新闻','pid' => 0),
  Array('cid' => 4,'cname' =>'体育','pid' => 0),
  Array('cid' => 5,'cname' => '娱乐','pid' => 0),
  Array('cid' => 7,'cname' => '热点新闻','pid' =>2),
  Array('cid' => 8,'cname' => '小众新闻','pid' => 2),
  Array('cid' => 9,'cname' => '民谣新闻','pid' => 8),
);

<?php
$arr=Array(
  Array('cid' => 2,'cname' => '新闻','pid' => 0),
  Array('cid' => 4,'cname' =>'体育','pid' => 0),
  Array('cid' => 5,'cname' => '娱乐','pid' => 0),
  Array('cid' => 7,'cname' => '热点新闻','pid' =>2),
  Array('cid' => 8,'cname' => '小众新闻','pid' => 2),
  Array('cid' => 9,'cname' => '民谣新闻','pid' => 8),
);
function formatTree($array, $pid = 0,$level = 1,$field = array('pid'=>'pid','id'=>'id','children'=>'children')){
    $arr = array();
    foreach ($array as &$v) {
      if ($v[$field['pid']] == $pid) {
        $v['level'] = $level;
        $tem = formatTree($array, $v[$field['id']],$v['level']+1,$field);
        //判断是否存在子数组
        $tem && $v[$field['children']] = $tem;
        $arr[] = $v;
      }
    }
    return $arr;
  }
$tree = formatTree( $arr,0,1, $field = array('pid'=>'pid','id'=>'cid','children'=>'children') );
echo '<pre>';
print_r( $tree); 
?>　

以下主要介绍了PHP超牛逼无限极分类生成树方法,巧用PHP中的引用实现树的生成方法,比递归方法高端多了,需要的朋友可以参考下

function generateTree($items){
    $tree = array();
    foreach($items as $item){
        if(isset($items[$item['pid']])){
            $items[$item['pid']]['son'][] = &$items[$item['id']];
        }else{
            $tree[] = &$items[$item['id']];
        }
    }
    return $tree;
}
$items = array(
    1 => array('id' => 1, 'pid' => 0, 'name' => '安徽省'),
    2 => array('id' => 2, 'pid' => 0, 'name' => '浙江省'),
    3 => array('id' => 3, 'pid' => 1, 'name' => '合肥市'),
    4 => array('id' => 4, 'pid' => 3, 'name' => '长丰县'),
    5 => array('id' => 5, 'pid' => 1, 'name' => '安庆市'),
);
print_r(generateTree($items));

可以看到下面打印的结果：

Array
(
    [0] => Array
        (
            [id] => 1
            [pid] => 0
            [name] => 安徽省
            [son] => Array
                (
                    [0] => Array
                        (
                            [id] => 3
                            [pid] => 1
                            [name] => 合肥市
                            [son] => Array
                                (
                                    [0] => Array
                                        (
                                            [id] => 4
                                            [pid] => 3
                                            [name] => 长丰县
                                        )
 
                                )
 
                        )
 
                    [1] => Array
                        (
                            [id] => 5
                            [pid] => 1
                            [name] => 安庆市
                        )
 
                )
 
        )
 
    [1] => Array
        (
            [id] => 2
            [pid] => 0
            [name] => 浙江省
        )
 
)

上面生成树方法还可以精简到5行：

function generateTree($items){
    foreach($items as $item)
        $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];
    return isset($items[0]['son']) ? $items[0]['son'] : array();
}

上面这种无限极分类数据树形结构化的方法值得借鉴。但是我觉得这段代码实际用途并不明显啊，你想取出格式化的树形数据还是要递归啊：

/**
 * 如何取数据格式化的树形数据
 */
$tree = generateTree($items);
function getTreeData($tree){
    foreach($tree as $t){
        echo $t['name'].'<br>';
        if(isset($t['son'])){
            getTreeData($t['son']);
        }
    }
}
getTreeData($tree);

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