本文实例讲述了php生成树的方法。分享给大家供大家参考。具体如下：
这个类不是我写的 只添加了getall()函数
php生成一个树，可以用于产品分类
不知道遍历写的是否优化，如果你有请分享一下吧 -.-！
运行效果如下图所示：
实现代码如下：
<?php
class tree
{
public $data=array();
public $catearray=array();
public $res=array();
function tree()
{
}
function setnode ($id, $parent, $value)
{
$parent = $parent?$parent:0;
$this->data[$id] = $value;
//print_r($this->data);
//echo "rn";
$this->catearray[$id] = $parent; //节点数组
//print_r($this->catearray);
}
function getchildstree($id=0)
{
$childs=array();
foreach ($this->catearray as $child=>$parent)
{
if ($parent==$id)
{
$childs[$child]=$this->getchildstree($child);
}
}
print_r($childs)."/r/n";
return $childs;
}
function getparentstree($id=0)
{
$parents=array();
foreach ($this->catearray as $child=>$parent)
{
if ($child ==$id)
{
$parents[$parent]=$this->getparentstree($parent);
}
}
print_r($parents)."/r/n";
return $parents;
}
function getchilds($id=0)
{
$childarray=array();
$childs=$this->getchild($id);
foreach ($childs as $child)
{
$childarray[]=$child;
$childarray=array_merge($childarray,$this->getchilds($child));
}
return $childarray;
}
function getchild($id)
{
$childs=array();
foreach ($this->catearray as $child=>$parent)
{
if ($parent==$id)
{
$childs[$child]=$child;
}
}
return $childs;
}
function getparents($id)
{
$parentarray=array();
$parents=$this->getparent($id);
foreach ($parents as $parent)
{
$parentarray[]=$parent;
$parentarray=array_merge($parentarray,$this->getparents($parent));
}
return $parentarray;
}
function getparent($id)
{
$parents=array();
foreach ($this->catearray as $child=>$parent)
{
if ($child==$id)
{
$parents[$parent]=$parent;
}
}
return $parents;
}
//单线获取父节点
function getnodelever($id)
{
$parents=array();
if (key_exists($this->catearray[$id],$this->catearray))
{
$parents[]=$this->catearray[$id];
$parents=array_merge($parents,$this->getnodelever($this->catearray[$id]));
}
return $parents;
}
function getlayer($id,$prestr='|-')
{
return str_repeat($prestr,count($this->getnodelever($id)));
}
function getvalue ($id)
{
return $this->data[$id];
} // end func
//获取所有节点数据生成树
function getall($id=0,$str="|-"){
if($id!=0){
$str=$str."|-";
}
//遍历所有数组检查parent是否有id
foreach($this->catearray as $child=>$parent){
//检查是否有相等的id
if($parent==$id){
$this->res[$child]=$str.$this->getvalue($child);
$this->getall($child,$str);
}
//$this->res[$child]=$child.$str.$this->getvalue($child);
}
}
}
//构造树
//setnode ($id, $parent, $value)
$tree = new tree();
$tree->setnode("1","","电器");
$tree->setnode("2","","服装");
$tree->setnode("3","1","电脑");
$tree->setnode("4","1","家电");
$tree->setnode("5","2","男装");
$tree->setnode("6","2","女装");
$tree->setnode("7","3","笔记本");
$tree->setnode("8","3","台式机");
$tree->setnode("9","7","惠普");
$tree->setnode("10","7","戴尔");
$tree->setnode("11","8","火星人");
$tree->setnode("12","5","西装");
$tree->setnode("13","6","上衣");
$tree->setnode("14","9","惠普-n90");
$tree->setnode("15","9","惠普-n91");
$tree->setnode("16","10","戴尔a11");
$tree->setnode("17","10","戴尔a12");
$tree->setnode("18","10","戴尔a13");
$tree->setnode("19","6","裤子 ");
$tree->setnode("20","13","长袖");
$tree->setnode("21","13","短袖");
$tree->setnode("22","20","nike长袖");
$tree->setnode("23","20","361长袖");
$tree->setnode("24","22","nike长袖-均码");
$tree->setnode("25","22","nike长袖-短码");
$tree->setnode("26","14","惠普-n90-14寸");
$tree->setnode("27","14","惠普-n90-15寸");
$tree->setnode("28","14","惠普-n90-17寸");
$tree->setnode("29","28","惠普-n90-17寸-高性能企业版");
$tree->setnode("30","28","惠普-n90-17寸-普通家用版");
//获取一个节点的所有父节点
//print_r ($tree->getnodelever(12));
//print_r ($tree->getparentstree(12));
//$childs = $tree->getchildstree(1);
//print_r($childs);
//echo "/r/n/r/n/r/n/r/n";
/*
foreach($childs as $key=>$value){
echo $key."<br>";
//echo $tree->getlayer($key).$tree->getvalue($key)."<br>";
}
*/
$tree->getall();
foreach($tree->res as $val){
echo $val."<br>";
}
?>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en"
"http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>生成tree</title>
</head>
<body>
<h5>生成标签测试</5>
<select>
<?php
foreach($tree->res as $key=>$val){
echo "<option value='{$key}'>{$val}</option>";
}
?>
</select>
</body>
</html>
希望本文所述对大家的php程序设计有所帮助。
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