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>