迎国庆，送你一棵树

<?
class Tree {
var $data = array();
var $tpl = @#<table cellpadding=0 cellspacing=0 border=0 style="font-size:9pt">$块</table>@#;
var $block = @#<tr onClick="tree_onclick()" bs=$标识><td background="$连线">$主图标</td><td>$副图标 $文字</td></tr><tr style="display:$可见"><td background="$连线"></td><td value="$编号">$子树</td></tr>@#;

var $images = array( // 节点图片
array("images/tree_L.gif","images/tree_T.gif","images/icon-page.gif"),
array("images/OpenFolder_L.gif","images/OpenFolder_T.gif","images/FolderClose.gif","images/FolderOpen.gif"),
array("images/CloseFolder_L.gif","images/CloseFolder_T.gif","images/FolderClose.gif","images/FolderOpen.gif"),
array("none","images/tree_I.gif"),
);

var $bond = array("","数据加载中...");
var $all = false; // 是否产生一棵子树

/**
* Tree 构造函数
*/
function Tree() {
}
/**
* table 方法
* 功能 产生以表格方式组织的数据
* 说明 主要用于调试
*/
function table($format="",$head="") {
if(count($this->data) <= 0) return $this->out = "";
$out = "<table $format><tr>";
if($head == "") {
foreach($this->data as $v) break;
$head = array_keys($v);
}
foreach($head as $v)
$out .= "<th>$v</th>";
$out .= "</tr>";
foreach($this->data as $value) {
$out .= "<tr>";
foreach($head as $k)
$out .= "<td>$value[$k]</td>";
$out .= "</tr>";
}
return $this->out = "$out</table>";
}
/**
* node_all 方法
* 功能 根据模板构造全部数据
*/
function node_all($id, $key=array("id","pid","text","link")) {
$this->all = true;
return $this->node($id,$key);
}
/**
* index 方法
* 功能 索引树
*/
function index($start=0, $key=array("id","pid")) {
$fun = create_function(@#$a,$b@#
,"if(\$a[$key[1]] == \$b[$key[1]]) return 0;"
."return \$a[$key[1]] > \$b[$key[1]]?1:-1;");
$out = array();
foreach($this->data as $k=>$v) {
if($v[$key[1]] == $start)
$out[] = $v;
else
$this->insert($v,&$out,$key);
}
return $this->data = $out;
}
/**
* insert 方法
* 功能 插入节点
*/
function insert($value,$array="",$key=array("id","pid")) {
if($array == "") $array =& $this->data;
if(count($array) <= 0) {
$array[] = $value;
return true;
}
$k = $m = $n = 0;
$ar = array();
foreach($array as $t) {
$k++;
if($t[$key[0]] == $value[$key[1]]) $m = $k;
if($t[$key[1]] == $value[$key[1]] || in_array($t[$key[1]],$ar)) {
$n = $k;
$ar[] = $t[$key[0]];
}
}
$k = max($m,$n);
if($k == 0) return false;
$array = array_merge(array_slice($array,0,$k),array($value),array_slice($array,$k));
return true;
}
/**
* update 方法
* 功能 修改节点
*/
function update() {
}
/**
* delete 方法
* 功能 删除节点
*/
function delete() {
}
/**
* move 方法
* 功能 移动节点
*/
function move() {
}
/**
* display 方法
* 功能 显示
*/
function display($type="node_all",$key=array("id","pid","text","link")) {
switch($type) {
case "table":
$this->table();
break;
case "node_all":
$this->out = $this->node_all(0,$key);
break;
}
echo $this->out;
$this->javascript();
}
function javascript() {
static $key;
if(! empty($key)) return;
echo <<< JS
<script>
function tree_onclick() {
el = event.srcElement;
switch(event.srcElement.tagName) {
case "A":
case "IMG":
while(el.tagName != "TR") el = el.parentElement;
break;
default:
return;
}
if(el.bs == 0) return; // bs=0 表示是叶节点; =1 为L接; >1 为T接
var pos = el.rowIndex;
var el1 = el.parentElement.rows[pos+1];
if(el1.style.display == "block") {
el1.style.display = "none";
el.cells[0].children[0].src = (el.bs==1?images[0][0]:images[0][1]);
if(el.cells[1].children[0]) el.cells[1].children[0].src = images[1][2];
}else {
el1.style.display = "block";
el.cells[0].children[0].src = (el.bs==1?images[1][0]:images[1][1]);
if(el.cells[1].children[0]) el.cells[1].children[0].src = images[1][3];
}
el = el1.cells[1];
if(el.innerHTML == bond) Tree_load.src = "?node="+el.value;
}
myload = 0;
function tree_load_end() { if(myload != 0) el.innerHTML = myload; }
</script>
<script id=@#Tree_load@# src=@#@# onreadystatechange=@#tree_load_end()@#></script>
JS;
$js = "<script>\n";
$js .= "images = new Array(\nnew Array(";
foreach($this->images[1] as $v) $js .= "@#$v@#,";
$js = substr($js,0,-1)."),\n";
$js .= "new Array(";
foreach($this->images[2] as $v) $js .= "@#$v@#,";
$js = substr($js,0,-1).")\n);\n";
$js .= "bond = @#{$this->bond[1]}@#;";
$js .= "</script>";
echo $js;
$key = 1;
}
function find($id,$key=array("id","pid")) {
foreach($this->data as $v)
if($v[$key[1]] == $id) return true;
return false;
}
/**
* filter方法
* 功能 返回$id的一级子集
*/
function filter($id,$key=array("id","pid")) {
$cmd = create_function(@#$var@#,"return(\$var[$key[1]]==@#$id@#);");
return array_filter($this->data,$cmd);
}
/**
* node 方法
* 功能 根据模板构造指定节点数据
*/
function node($id,$key=array("id","pid","text","link")) {
$ar = $this->filter($id,$key);
if(($n = count($ar)) == 0) return "";
$块 = "";
foreach($ar as $value) {
$n--;
$p = sign($value[node_childs]);
$可见 = "none";//"block";
$标识 = $p==0 ? $p : $p+$n;
$主图标 = "<img src=\"{$this->images[$p][sign($n)]}\">";
$副图标 = empty($this->images[$p][2]) ? "" : "<img src=\"{$this->images[$p][2]}\">";
$文字 = empty($value[$key[3]]) ? $value[$key[2]] : "<a href=\"{$value[$key[3]]}\">{$value[$key[2]]}</a>";
$连线 = $this->images[3][sign($n)];

$编号 = $value[id];
$子树 = $this->all ? $this->node($value[$key[0]],$key) : $this->bond[$p];
$块 .= eval("return \"".AddSlashes($this->block)."\";");
}
return eval("return \"\n".AddSlashes($this->tpl)."\";");
}
/**
* build方法
* 功能 计算各节点的一级子节点数，用附加的node_childs表示
*/
function build($key=array("id","pid")) {
foreach($this->data as $k=>$v) {
$this->data[$k][node_childs] = count($this->filter($v[$key[0]]));
}
}
}

class exTree extends Tree {
var $images = array( // 节点图片
array("images/icon-page.gif"), // 无子节点
array("images/OpenFolder.gif","images/OpenFolder.gif"), // 子节点关闭
array("images/CloseFolder.gif","images/CloseFolder.gif") ); // 子节点打开
}

$t = new Tree;
//$t = new exTree; // 去掉注释看看效果

$ar = array(
array(id=>1,pid=>0,text=>"PHP",link=>"#"),
array(id=>2,pid=>1,text=>"函数"),
array(id=>5,pid=>1,text=>"类"),
array(id=>3,pid=>0,text=>"ASP"),
array(id=>4,pid=>2,text=>"d"),
array(id=>6,pid=>3,text=>"66"),
array(id=>7,pid=>0,text=>"JSP")
);
//$t->data = $ar;

foreach($ar as $v)
$t->insert($v);

$t->insert(array(id=>8,pid=>4,text=>"abc",link=>"aaaa"));

$t->build();

if(! isset($_GET[@#node@#])) {
$t->display("table");
if(0) // 1 一次性加载
$t->display();
else { // 分步加载
$t->javascript();
echo $t->node(0);
}
}else { // 分步加载时返回指定节点
$s = $t->node($_GET[@#node@#]);
$s = preg_replace("/\r?\n/","\\n",$s);
echo "myload = @#$s@#";
}
?>

原文转自：http://www.ltesting.net