PHP ordering of two-dimensional arrays

Now there is a two-dimensional array

$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'),);

I want to reorder it according to the date dates inside, and get a new array like this:

$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'),);

What should I do?

Reply content:

Now there is a two-dimensional array

$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'),);

I want to reorder it according to the date dates inside, and get a new array like this:

$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'),);

What should I do?

Directly on the code

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

Using Array_multisort
Reference: Http://cn2.php.net/array_multisort

php$sort = array(      'direction' => 'SORT_ASC', //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序      'field'     => 'date',       //排序字段  );$arrSortTmp = array();  foreach($arr AS $uniqid => $row){      foreach($row AS $key=>$value){          $arrSortTmp[$key][$uniqid] = $value;      }  }array_multisort($arrSortTmp[$sort["field"]],constant($sort["direction"]), $arr);var_dump($arr);

$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 '),
);

Array_multisort ($arr, SORT_ASC);

Print_r ($arr);

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