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?
慕少森
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