php遞迴函式實現無限級樹型菜單

來源:互聯網
上載者:User

標籤:blog   http   io   os   java   ar   for   資料   2014   

!!寫遞迴函式,可考慮緩衝,定義一些靜態變數來存上一次啟動並執行結果,多程式運行效率很有協助.

大概步驟如下:
首先到資料庫取資料,放到一個數組,
然後把資料轉化為一個樹型狀的數組,
最後把這個樹型狀的數組轉為html代碼。
也可以將第二步和第三步合為一步。

詳細如下:
1。資料庫設計:
指令碼如下:
CREATE TABLE `bg_cate` (
`cate_Id` int(30) unsigned NOT NULL AUTO_INCREMENT,
`cate_ParentId` int(30) unsigned DEFAULT ‘0‘,
`cate_Name` varchar(100) NOT NULL,
`cate_Intro` varchar(500) DEFAULT NULL,
`cate_Order` int(30) unsigned DEFAULT ‘0‘,
`cate_Icon` varchar(100) DEFAULT NULL,
PRIMARY KEY (`cate_Id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=34 ;

--
-- 匯出表中的資料 `bg_cate`
--

INSERT INTO `bg_cate` (`cate_Id`, `cate_ParentId`, `cate_Name`, `cate_Intro`, `cate_Order`, `cate_Icon`) VALUES
(4, 0, ‘往事如風‘, ‘記錄往事‘, 0, ‘icons/6.gif‘),
(5, 0, ‘水煮三國‘, ‘品位三國智慧‘, 0, ‘icons/3.gif‘),
(2, 0, ‘技術學習‘, ‘平時學習的一些筆記,歡迎批評指正。‘, 0, ‘icons/18.gif‘),
(3, 0, ‘生活點滴‘, ‘記錄生活點滴‘, 0, ‘icons/2.gif‘),
(6, 0, ‘梔子花開‘, ‘青春無限‘, 0, ‘icons/8.gif‘),
(7, 0, ‘假日休閑‘, ‘悠閑、自在‘, 0, ‘icons/24.gif‘),
(8, 2, ‘html‘, ‘html學習‘, 0, ‘icons/1.gif‘),
(9, 2, ‘css‘, ‘css學習‘, 0, ‘icons/1.gif‘),
(10, 2, ‘php‘, ‘php學習‘, 0, ‘icons/18.gif‘),
(11, 10, ‘php基礎知識‘, ‘php基礎知識‘, 0, ‘icons/1.gif‘),
(12, 10, ‘oop‘, ‘oop‘, 0, ‘icons/1.gif‘),
(13, 10, ‘php安全‘, ‘講述php安全‘, 0, ‘icons/1.gif‘),
(14, 10, ‘seagull framework‘, ‘seagull framework‘, 0, ‘icons/1.gif‘),
(15, 2, ‘javascript‘, ‘javascript學習‘, 0, ‘icons/1.gif‘),
(16, 2, ‘設計模式‘, NULL, 0, ‘icons/1.gif‘),
(17, 2, ‘軟體工程‘, ‘軟體工程學習‘, 0, ‘icons/1.gif‘),
(18, 3, ‘廈門生活‘, ‘廈門生活‘, 0, ‘icons/8.gif‘),
(19, 3, ‘大學生活‘, ‘大學生活‘, 0, ‘icons/8.gif‘),
(20, 3, ‘童年生活‘, ‘童年生活‘, 0, ‘icons/15.gif‘),
(21, 19, ‘學習‘, ‘學習‘, 0, ‘icons/1.gif‘),
(22, 19, ‘運動‘, ‘運動‘, 0, ‘icons/16.gif‘),
(23, 19, ‘旅遊‘, ‘旅遊‘, 0, ‘icons/24.gif‘),
(24, 22, ‘排球‘, ‘排球‘, 0, ‘icons/9.gif‘),
(25, 22, ‘籃球‘, ‘籃球‘, 0, ‘icons/9.gif‘),
(26, 22, ‘羽毛球‘, ‘羽毛球‘, 0, ‘icons/9.gif‘),
(27, 22, ‘乒乓球‘, ‘乒乓球‘, 0, ‘icons/9.gif‘);


2。到資料庫取資料,放到數組。
require_once ‘./classes/MyDB.php‘;
$con = MyDB::singleton();
$sql = <<<SQL
   select * from bg_cate cate
SQL;
$data = $con->getAll($sql);
//print_r($data);
資料庫操作我用的是pear類庫。
最後的$data的資料格式如下:
?Array
(
   [0] => Array
       (
           [cate_Id] => 4
           [cate_ParentId] => 0
           [cate_Name] => 往事如風
           [cate_Intro] => 記錄往事
           [cate_Order] => 0
           [cate_Icon] => icons/6.gif
       )

   [1] => Array
       (
           [cate_Id] => 5
           [cate_ParentId] => 0
           [cate_Name] => 水煮三國
           [cate_Intro] => 品位三國智慧
           [cate_Order] => 0
           [cate_Icon] => icons/3.gif
       )
。。。。。。


3。把上一步的資料轉為樹型狀的數組
代碼如下:
function getTree($data, $pId)
{
$tree = ‘‘;
foreach($data as $k => $v)
{
  if($v[‘cate_ParentId‘] == $pId)
  {        //父親找到兒子
   $v[‘cate_ParentId‘] = getTree($data, $v[‘cate_Id‘]);
   $tree[] = $v;
   //unset($data[$k]);
  }
}
return $tree;
}
$tree = getTree($data, 0);
最後輸出$tree的資料格式為:
?Array
(
   [0] => Array
       (
           [cate_Id] => 4
           [cate_ParentId] =>
           [cate_Name] => 往事如風
           [cate_Intro] => 記錄往事
           [cate_Order] => 0
           [cate_Icon] => icons/6.gif
       )

   [1] => Array
       (
           [cate_Id] => 5
           [cate_ParentId] =>
           [cate_Name] => 水煮三國
           [cate_Intro] => 品位三國智慧
           [cate_Order] => 0
           [cate_Icon] => icons/3.gif
       )

   [2] => Array
       (
           [cate_Id] => 2
           [cate_ParentId] => Array
               (
                   [0] => Array
                       (
                           [cate_Id] => 8
                           [cate_ParentId] =>
                           [cate_Name] => html
                           [cate_Intro] => html學習
                           [cate_Order] => 0
                           [cate_Icon] => icons/1.gif
                       )
。。。。。。。。。。。


4。把樹型狀數組轉為html
代碼如下:
function procHtml($tree)
{
$html = ‘‘;
foreach($tree as $t)
{
  if($t[‘cate_ParentId‘] == ‘‘)
  {
   $html .= "<li>{$t[‘cate_Name‘]}</li>";
  }
  else
  {
   $html .= "<li>".$t[‘cate_Name‘];
   $html .= procHtml($t[‘cate_ParentId‘]);
   $html = $html."</li>";
  }
}
return $html ? ‘<ul>‘.$html.‘</ul>‘ : $html ;
}
echo procHtml($tree);
輸出的html的代碼格式為:
<ul>
<li>往事如風</li>
<li>水煮三國</li>
<li>技術學習
  <ul>
   <li>html</li>
   <li>css</li>
   <li>php
    <ul>
     <li>php基礎知識</li>
     <li>oop</li>
     <li>php安全</li>
。。。。。。。。。。。。。。。。

5。也可以把第3和第4步的代碼合在一起,代碼如下:
function getTree($data, $pId)
{
$html = ‘‘;
foreach($data as $k => $v)
{
  if($v[‘cate_ParentId‘] == $pId)
  {        //父親找到兒子
   $html .= "<li>".$v[‘cate_Name‘];
   $html .= getTree($data, $v[‘cate_Id‘]);
   $html = $html."</li>";
  }
}
return $html ? ‘<ul>‘.$html.‘</ul>‘ : $html ;
}
echo getTree($data, 0);

6。最後再加點css樣式,效果如下:

php遞迴函式實現無限級樹型菜單

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