<html>
  <head>
    <title>
      智能遞歸菜單-讀取數(shù)據(jù)庫
    </title>
    <style>
      TD { FONT-FAMILY: "Verdana", "宋體"; FONT-SIZE: 12px; LINE-HEIGHT: 130%;
      letter-spacing:1px } A:link { COLOR: #990000; FONT-FAMILY: "Verdana", "宋體";
      FONT-SIZE: 12px; TEXT-DECORATION: none; letter-spacing:1px } A:visited
      { COLOR: #990000; FONT-FAMILY: "Verdana", "宋體"; FONT-SIZE: 12px; TEXT-DECORATION:
      none; letter-spacing:1px } A:active { COLOR: #990000; FONT-FAMILY: "Verdana",
      "宋體"; FONT-SIZE: 12px; TEXT-DECORATION: none; letter-spacing:1px } A:hover
      { COLOR: #ff0000; FONT-FAMILY: "Verdana", "宋體"; FONT-SIZE: 12px; TEXT-DECORATION:
      underline; letter-spacing:1px } .Menu { COLOR:#000000; FONT-FAMILY: "Verdana",
      "宋體"; FONT-SIZE: 12px; CURSOR: hand }
    </style>
    <script language=javascript>
      function ShowMenu(MenuID) {
        if (MenuID.style.display == "none") {
          MenuID.style.display = "";
        } else {
          MenuID.style.display = "none";
        }
      }
    </script>
  </head>
  <body>
<?php
// $Id:$
//基本變量設(shè)置
$GLOBALS["ID"] = 1;
//用來跟蹤下拉菜單的ID號 $layer=1;
//用來跟蹤當(dāng)前菜單的級數(shù)
//連接數(shù)據(jù)庫
$Con=mysql_connect( "localhost", "root", "123456"); mysql_select_db(
"menu");
//提取一級菜單
$sql="select * from menu where parent_id=0" ;
$result=mysql_query($sql,$Con);
//如果一級菜單存在則開始菜單的顯示
if(mysql_num_rows($result)>0) ShowTreeMenu($Con, $result, $layer, $ID); 
//=============================================
//顯示樹型菜單函數(shù) ShowTreeMenu($con,$result,$layer) //$con：數(shù)據(jù)庫連接 
//$result：需要顯示的菜單記錄集
//layer：需要顯示的菜單的級數(shù) 
//=============================================
function
ShowTreeMenu($Con, $result, $layer) {
//取得需要顯示的菜單的項(xiàng)目數(shù)
$numrows=mysql_num_rows($result);
  //開始顯示菜單，每個(gè)子菜單都用一個(gè)表格來表示 echo "
   < tablecellpadding = '0'cellspacing = '0'border = '0' > "; for($rows=0;$rows
        <$numrows;$rows++) { //將當(dāng)前菜單項(xiàng)目的內(nèi)容導(dǎo)入數(shù)組 $menu=mysql_fetch_array($result);
        //提取菜單項(xiàng)目的子菜單記錄集 $sql="select * frommenuwhereparent_id = $menu[id]" ; $result_sub=mysql_query($sql,$Con);
        echo " < tr > "; //如果該菜單項(xiàng)目有子菜單，則添加JavaScript onClick語句 if(mysql_num_rows($result_sub)>
          0) { echo " < tdwidth = '20' > < imgsrc = 'tree_expand.gif'border = '0' > < / td > "; echo " < tdclass = 'Menu'onClick = 'javascript:ShowMenu(Menu".$GLOBALS["ID"].");' > "; } else { echo " < tdwidth = '20' > < imgsrc = 'tree_collapse.gif'border = '0' > < / td > "; echo " < tdclass = 'Menu' > "; } //如果該菜單項(xiàng)目沒有子菜單，并指定了超級連接地址，則指定為超級連接， //否則只顯示菜單名稱 if($menu[url]!="")
              echo " < ahref = '$menu[url]' > $menu[name] < / a > "; else echo $menu[name]; echo " < / td > < / tr > "; //如果該菜單項(xiàng)目有子菜單，則顯示子菜單 if(mysql_num_rows($result_sub)>0) { //指定該子菜單的ID和style，以便和onClick語句相對應(yīng)
            echo " < trid = Menu".$GLOBALS["ID "]++ . " style='display:none'>";
  echo "<td width='20'></td>";
  echo "<td>";
  //將級數(shù)加1
  $layer++;
  //遞歸調(diào)用ShowTreeMenu()函數(shù)，生成子菜單 
  ShowTreeMenu($Con,$result_sub,$layer);
  //子菜單處理完成，返回到遞歸的上一層，將級數(shù)減1
  $layer--;
  echo "< / td > < / tr > ";
  }
  //繼續(xù)顯示下一個(gè)菜單項(xiàng)目
  } echo " < / table > "; }
  ?>
      <?php
      $id=1 ;
      function test() {
      global $id; unset($id);
      }
      test();
      echo " < fontclass = menu > ".($id). " < / font > ";
      // 在 PHP 4 中這里會(huì)打印出 1
      ?>
      <?php
      $a=1 ;
      $b=2 ;
      function Sum() {
      global $a, $b; $b=$ a + $b;
      }
      Sum();
      echo " < fontclass = menu > ".$b. " < / font > ";
      ?>
  </body>
</html>

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