3级菜单

<?php

$array =[

['id'=>1,'pid'=>0,'name'=>'电视'],

['id'=>2,'pid'=>1,'name'=>'美式电视'],

['id'=>3,'pid'=>1,'name'=>'中式电视'],

['id'=>4,'pid'=>2,'name'=>'美的'],

['id'=>5,'pid'=>2,'name'=>'中央'],

['id'=>6,'pid'=>0,'name'=>'冰箱'],

['id'=>7,'pid'=>6,'name'=>'制冷冰箱'],

['id'=>8,'pid'=>7,'name'=>'美的冰箱'],

];

 

/**

* 形成2叉树

*/

function getTree($array,$pid=0,$level=0,$html='-'){

$tree = array();

foreach($array as $row){

if($row['pid']==$pid){

$row['level']=$level+1;

$row['html']=str_repeat($html,$level);

$tree[]=$row;

$tree = array_merge($tree,getTree($array,$row['id'],$level+1,$html));

}

}

return $tree;

}

$result = getTree($array);

// print_r($result);

/**

* 显示二叉树

*/

function showTree($array){

$tab = "";

$tab.="<ul>";

foreach ($array as $row) {

$tab.="<li><a href=''>".$row['html'].$row['name']."</a></li>";

}

$tab.="</ul>";

echo $tab;

}

showTree($result);

 

/**

*

*/

function getParent($array,$id){

$parent=array();

foreach ($array as $row) {

if($row['id']==$id){

$parent[]=$row;

if($row['pid']>0){

$parent=array_merge($parent,getParent($array,$row['pid']));

}

}

}

return $parent;

}

$getParent = getParent($array,4);

for($i=count($getParent)-1;$i>=0;$i--){

// print_r($getParent[$i]);

if($i!=0) echo $getParent[$i]['name']."&gt;&gt;";

else echo $getParent[$i]['name'];

}

// print_r($getParent);

?>