php 二维数组以树形输出(转)

<?php

/**
* @author Skyline
* @copyright 2011
*/

$cate = array(
1=>array(
\'id\'=>1,
\'pid\'=>0,
\'name\'=>\'News_1\'
),
2=>array(
\'id\'=>2,
\'pid\'=>1,
\'name\'=>\'News_12\'
),
7=>array(
\'id\'=>7,
\'pid\'=>1,
\'name\'=>\'News_17\'
),
3=>array(
\'id\'=>3,
\'pid\'=>2,
\'name\'=>\'News_123\'
),
8=>array(
\'id\'=>8,
\'pid\'=>7,
\'name\'=>\'News_178\'
),
4=>array(
\'id\'=>4,
\'pid\'=>0,
\'name\'=>\'News_4\'
),
5=>array(
\'id\'=>5,
\'pid\'=>4,
\'name\'=>\'News_45\'
),
6=>array(
\'id\'=>6,
\'pid\'=>5,
\'name\'=>\'News_456\'
)
);

function getchild($pid,$arr){
$sa = $newarr = array();
if(is_array($arr)){
foreach($arr as $id => $sa){
if($sa[\'pid\']== $pid) $newarr[$id]=$sa;
}
}
return $newarr ? $newarr :false;
}

function get_tree($pid,$arr,$num){
global $str;
$child = getchild($pid,$arr);

if(is_array($child)){

$total = count($child);
foreach($child as $id => $sa){
$pstr =\'|-\';
for($i =0; $i <= $num; $i ++){
$pstr = $pstr .\'----\';
}
$str = $str . $pstr . $sa[\'name\']."-----$num "." <br>";
$num++;
get_tree($sa[\'id\'],$arr,$num);
$num--;
}
}else{return;}
}

get_tree(0,$cate,0);
echo $str;

?>