$arr=array(array('132','20120524','23232.2','21.31'),array('126','20120524','-231232.2','13.321'),array('321','20120524','232.32','1.31')));
根据第3小组数据进行降序输出，请老师指教，谢谢！
------解决方案--------------------
- PHP code
foreach($arr as $v) $t[]=$v[2];array_multisort($t,SORT_DESC,$arr);print_r($arr);