问个二位数组操作有关问题

问个二位数组操作问题
$aa=array("id"=>"1","time"=>"5","neirong"=>"www");
$aa=array("id"=>"2","time"=>"55","neirong"=>"www");
$aa=array("id"=>"4","time"=>"555","neirong"=>"www");
$aa=array("id"=>"5","time"=>"555","neirong"=>"www");
$aaa=array("duibi"=>$aa);

$bb=array("id"=>"1","time"=>"5");
$bb=array("id"=>"2","time"=>"50");
$bb=array("id"=>"3","time"=>"555");
$bbb=array("duibi"=>$bb);

$aaa和$bbb对比操作 
变成
$cc=array("id"=>"2","time"=>"55","neirong"=>"www");
$cc=array("id"=>"3","neirong"=>"delete");
$cc=array("id"=>"4","time"=>"555","neirong"=>"www");
$cc=array("id"=>"5","time"=>"555","neirong"=>"www");

怎么写



先说明下

$aa=array("id"=>"1","time"=>"5","neirong"=>"www");这个数据之所已没有是因为 $aa和$bb时间是一样的 

$aa=array("id"=>"2","time"=>"55","neirong"=>"www");
$bb=array("id"=>"2","time"=>"50");
那是因为bbdetime比aa得time小所以。。

$cc=array("id"=>"3","neirong"=>"delete");对应的$aa不存在所以。。


$cc=array("id"=>"4","time"=>"555","neirong"=>"www");
$cc=array("id"=>"5","time"=>"555","neirong"=>"www");

因为$bb没有对应的id 4和5的数据。。所以





------解决方案--------------------

$aa = array(
  array("id"=>"1","time"=>"5","neirong"=>"www"),
  array("id"=>"2","time"=>"55","neirong"=>"www"),
  array("id"=>"4","time"=>"555","neirong"=>"www"),
  array("id"=>"5","time"=>"555","neirong"=>"www"),
);

$bb = array(
  array("id"=>"1","time"=>"5"),
  array("id"=>"2","time"=>"50"),
  array("id"=>"3","time"=>"555"),
);

foreach($aa as $v) $r[$v['id']] = $v;
foreach($bb as $v) {
  $k = $v['id'];
  if(! isset($r[$k])) $r[$k] = $v;
  elseif($r[$k]['time'] < $v['time']) $r[$k] = $v;
  elseif($r[$k]['time'] == $v['time']) unset($r[$k]);
}
ksort($r);
print_r($r);

Array
(
    [2] => Array
        (
            [id] => 2
            [time] => 55
            [neirong] => www
        )

    [3] => Array
        (
            [id] => 3
            [time] => 555
        )

    [4] => Array
        (
            [id] => 4
            [time] => 555
            [neirong] => www
        )

    [5] => Array
        (
            [id] => 5
            [time] => 555
            [neirong] => www
        )

)