PHP 对二维数组排序

Question

现在有一个二维数组$arr=array(array('date'=>'2011-04-21','wu'=>'test'),array('date'=>'2014-04-21','wu'=>'good'),array('date'=>'2011-12-22','wu'=>'great'),array('date'=>'2012-05-21','wu'=>'hahah'),array('date'=>'2013-08-13','wu'=>'test'),array('date'=>'2011-04-25','wu'=>'yes'),array('date'=>'2014-04-14','wu'=>'no'),);我想将它按照里面date日期来重新排序，得到这样的新数组：$arr2=array(array('date'=>'2011-04-21','wu'=>'test'),array('date'=>'2011-04-25','wu'=>'yes'),array('date'=>'2011-12-22','wu'=>'great'),array('date'=>'2012-05-21','wu'=>'hahah'),array('date'=>'2013-08-13','wu'=>'test'),array('date'=>'2014-04-14','wu'=>'no'),array('date'=>'2014-04-21','wu'=>'good'),);请问应该怎样做呢？

Answer 1

直接上代码
$tmp=array();
foreach($arras$a){
$tmp[$a['date'].'_'.$a['wu'].'_'.rand(1000000,9999999)]=$a;
}
asort($tmp);
$arr=array_values($tmp);