PHP中找家谱树的几种方法

<?php
	$area = array(
		array('id'=>1,'name'=>'安徽','parent'=>0),
		array('id'=>2,'name'=>'海淀','parent'=>7),
		array('id'=>3,'name'=>'濉溪县','parent'=>5),
		array('id'=>4,'name'=>'昌平','parent'=>7),
		array('id'=>5,'name'=>'淮北','parent'=>1),
		array('id'=>6,'name'=>'朝阳','parent'=>7),
		array('id'=>7,'name'=>'北京','parent'=>0),
		array('id'=>8,'name'=>'上地','parent'=>2)
		);



function DieDai($arr,$id){
			$subtree=array();
			while($id){
			foreach($arr as $val){
				if($val['id']==$id){
					$subtree[]=$val;
					if($val['parent']!==0){
						$id=$val['parent'];
					}else{
						break 2;
					}
				}
			}
			}
			return $subtree;
		}
	echo "<pre>";
		print_r(DieDai($area,3));
	function DiGui($arr,$id){
		static $root=array();
		foreach($arr as $val){
			if($val['id']==$id){
				$root[]=$val;
				if($val['parent']!==0){
					$id1=$val['parent'];
					DiGui($arr,$id1);
				}else{
					break;
				}
			}
		}
		return $root;
	}


	print_r(DiGui($area,3));


	function findfam($arr,$area){
			static $fam=array();
		foreach($arr as $val){
			if($val['name']==$area){
				$parentid=$val['parent'];
				foreach($arr as $v){
					if($v['id']==$parentid){
						$area=$v['name'];
						$fam[]=$area;
						findfam($arr,$area);
					}
				}
			}
		}
		return $fam;
	}
	
	print_r(findfam($area,'濉溪县'));

	echo "</pre>";