PHP 對二維數組排序

現在有一個二維數組

$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'),);

我想將它按照裡面date日期來重新排序，得到這樣的新數組：

$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'),);

請問應該怎樣做呢？

回複內容：

現在有一個二維數組

$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'),);

我想將它按照裡面date日期來重新排序，得到這樣的新數組：

$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'),);

請問應該怎樣做呢？

直接上代碼

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

使用 array_multisort
參考：http://cn2.php.net/array_multisort

php$sort = array(      'direction' => 'SORT_ASC', //排序次序標誌 SORT_DESC 降序；SORT_ASC 升序      'field'     => 'date',       //排序欄位  );$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);

