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php產生無限欄位樹_php技巧

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發布： 2023-03-13 11:50:02

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本文主要介紹了php生成無限欄目樹的相關知識。具有很好的參考價值。下面跟著小編一起來看下吧

欄位陣列:

$arr=Array(
  Array(&#39;cid&#39; => 2,&#39;cname&#39; => &#39;新闻&#39;,&#39;pid&#39; => 0),
  Array(&#39;cid&#39; => 4,&#39;cname&#39; =>&#39;体育&#39;,&#39;pid&#39; => 0),
  Array(&#39;cid&#39; => 5,&#39;cname&#39; => &#39;娱乐&#39;,&#39;pid&#39; => 0),
  Array(&#39;cid&#39; => 7,&#39;cname&#39; => &#39;热点新闻&#39;,&#39;pid&#39; =>2),
  Array(&#39;cid&#39; => 8,&#39;cname&#39; => &#39;小众新闻&#39;,&#39;pid&#39; => 2),
  Array(&#39;cid&#39; => 9,&#39;cname&#39; => &#39;民谣新闻&#39;,&#39;pid&#39; => 8),
);

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'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 '';
print_r( $tree); 
?>　
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以下主要介紹了PHP超牛逼無限極分類生成樹方法,巧用PHP中的引用實作樹的生成方法,比遞歸方法高階多了,需要的朋友可以參考下

function generateTree($items){
    $tree = array();
    foreach($items as $item){
        if(isset($items[$item[&#39;pid&#39;]])){
            $items[$item[&#39;pid&#39;]][&#39;son&#39;][] = &$items[$item[&#39;id&#39;]];
        }else{
            $tree[] = &$items[$item[&#39;id&#39;]];
        }
    }
    return $tree;
}
$items = array(
    1 => array(&#39;id&#39; => 1, &#39;pid&#39; => 0, &#39;name&#39; => &#39;安徽省&#39;),
    2 => array(&#39;id&#39; => 2, &#39;pid&#39; => 0, &#39;name&#39; => &#39;浙江省&#39;),
    3 => array(&#39;id&#39; => 3, &#39;pid&#39; => 1, &#39;name&#39; => &#39;合肥市&#39;),
    4 => array(&#39;id&#39; => 4, &#39;pid&#39; => 3, &#39;name&#39; => &#39;长丰县&#39;),
    5 => array(&#39;id&#39; => 5, &#39;pid&#39; => 1, &#39;name&#39; => &#39;安庆市&#39;),
);
print_r(generateTree($items));

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可以看到下面印刷的結果：

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
        )
 
)

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上面生成樹方法還可以精簡到5行：

function generateTree($items){
    foreach($items as $item)
        $items[$item[&#39;pid&#39;]][&#39;son&#39;][$item[&#39;id&#39;]] = &$items[$item[&#39;id&#39;]];
    return isset($items[0][&#39;son&#39;]) ? $items[0][&#39;son&#39;] : array();
}

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上面這種無限極分類資料樹狀結構化的方法值得借鏡。但我覺得這段程式碼實際用途並不明顯啊，你想取出格式化的樹狀資料還是要遞歸啊：

/**
 * 如何取数据格式化的树形数据
 */
$tree = generateTree($items);
function getTreeData($tree){
    foreach($tree as $t){
        echo $t[&#39;name&#39;].&#39;<br>&#39;;
        if(isset($t[&#39;son&#39;])){
            getTreeData($t[&#39;son&#39;]);
        }
    }
}
getTreeData($tree);

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