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 "\r\n";
$this->cateArray[$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。