php数组的排重、累加、排序处理，50分全部送上！解决方法

php数组的排重、累加、排序处理，50分全部送上！

PHP code

$t = array (  array(  'cid'  => 123,  'hits' => 200,  ),  array(  'cid'  => 456,  'hits' => 100,  ),  array(  'cid'  => 789,  'hits' => 300,  ),  array(  'cid'  => 123,  'hits' => 600,  ),  array(  'cid'  => 456,  'hits' => 500,  ),  array(  'cid'  => 789,  'hits' => 700,  ),);

数组中有很多值是重复的cid，他们对应的hits不一样，希望进行cid排重，hits累加，再按照hits倒序排列，输出结果如下：

PHP code

$t = array (  array(  'cid'  => 789,  'hits' => 1000,  ),  array(  'cid'  => 123,  'hits' => 800,  ),  array(  'cid'  => 456,  'hits' => 600,  ),);

多谢大家了！

------解决方案--------------------

PHP code

foreach($t as $v){     if(!$ar[$v['cid']])             $ar[$v['cid']]=$v;     else             $ar[$v['cid']]['hits']+=$v['hits'];     }foreach($ar as $v) $k[]=$v[hits];array_multisort($k,SORT_DESC,$ar);print_r($ar);
------解决方案--------------------

PHP code

$t = array (  array(  'cid'  => 123,  'hits' => 200,  ),  array(  'cid'  => 456,  'hits' => 100,  ),  array(  'cid'  => 789,  'hits' => 300,  ),  array(  'cid'  => 123,  'hits' => 600,  ),  array(  'cid'  => 456,  'hits' => 500,  ),  array(  'cid'  => 789,  'hits' => 700,  ),);$r = array();foreach($t as $v) {  if(!isset($r[$v['cid']])) $r[$v['cid']] = $v;  else $r[$v['cid']]['hits'] += $v['hits'];}usort($r, create_function('$a,$b', 'return $a["hits"]