在php中递归查询节点解决方案

1.示例1
function find_child($ar, $id='id', $pid='pid') {
  foreach($ar as $v) $t[$v[$id]] = $v;
  foreach ($t as $k => $item){
    if( $item[$pid] ) {
    	$t[$item[$pid]]['child'][] =&$t[$k];
      	unset($t[$k]);
    }
  }
  return $t;
}
$data = array(
	array('ID'=>1,'PARENT'=>0,'NAME'=>'kobe'),
	array('ID'=>2,'PARENT'=>0,'NAME'=>'jama'),
	array('ID'=>3,'PARENT'=>1,'NAME'=>'kobe1'),
	array('ID'=>4,'PARENT'=>2,'NAME'=>'jama1'),	
	array('ID'=>5,'PARENT'=>0,'NAME'=>'lizhi'),	
	array('ID'=>6,'PARENT'=>1,'NAME'=>'kobe2'),
);

$c = find_child($data, 'ID', 'PARENT');
echo '
';
print_r($c);
?>


2.示例2

function find_child($ar, $id='id', $pid='pid') {
  foreach($ar as $v) $t[$v[$id]] = $v;
  foreach ($t as $k => $item){
    if( $item[$pid] ) {
    	$t[$item[$pid]]['child'][] =&$t[$k];
      	unset($t[$k]);
    }
  }
  return $t;
}
$data = array(
	array('ID'=>1,'PARENT'=>0,'NAME'=>'kobe'),
	array('ID'=>2,'PARENT'=>0,'NAME'=>'jama'),
	array('ID'=>3,'PARENT'=>1,'NAME'=>'kobe1'),
	array('ID'=>4,'PARENT'=>2,'NAME'=>'jama1'),	
	array('ID'=>5,'PARENT'=>0,'NAME'=>'lizhi'),	
	array('ID'=>6,'PARENT'=>1,'NAME'=>'kobe2'),
);

$c = find_child($data, 'ID', 'PARENT');
echo '
';
print_r($c);
?>

------解决方案--------------------

$arr = array(
	1=>array('id'=>'1','name'=>'1','pid'=>'0'),
	2=>array('id'=>'2','name'=>'2','pid'=>'0'),
	3=>array('id'=>'3','name'=>'11','pid'=>'1'),
	4=>array('id'=>'4','name'=>'22','pid'=>'2'),
);
function tree($arr){
	$t = array();
	foreach($arr as $v){
		if (isset($arr[$v['pid']])){
			$arr[$v['pid']]['child'][] = &$arr[$v['id']];
		}else{
			$t[] = &$arr[$v['id']];
		}
	}
	return $t;
}
echo '
';print_r(tree($arr));