php数组的统计解决办法

php数组的统计
我有这样的一个数组，不知道怎么来统计，A\B\c的分数
Array
(
  [0] => Array
  (
  [0] => A
  [1] => A因素
  [2] => 1 //A因数的分数
  )
 
  [1] => Array
  (
  [0] => A
  [1] => A因素
  [2] => 3
  )
 
  [2] => Array
  (
  [0] => A
  [1] => A因素
  [2] => 6
  )
 
  [3] => Array
  (
  [0] => A
  [1] => A因素
  [2] => 6
  )
 
  [4] => Array
  (
  [0] => A
  [1] => A因素
  [2] => 1
  )
 
  [5] => Array
  (
  [0] => B
  [1] => B因素
  [2] => 1
  )
 
  [6] => Array
  (
  [0] => B
  [1] => B因素
  [2] => 2
  )
 
  [7] => Array
  (
  [0] => B
  [1] => B因素
  [2] => 3
  )
 
  [8] => Array
  (
  [0] => B
  [1] => B因素
  [2] => 1
  )
 
  [9] => Array
  (
  [0] => C
  [1] => C因素
  [2] => 1
  )
 
  [10] => Array
  (
  [0] => C
  [1] => C因素
  [2] => 5
  )
 
)


------解决方案--------------------

PHP code

$ar = array(    array('A','A因素',1),    array('A','A因素',3),    array('A','A因素',6),    array('A','A因素',6),    array('A','A因素',1),    array('B','B因素',1),    array('B','B因素',2),    array('B','B因素',3),    array('B','B因素',1),    array('C','C因素',1),    array('C','C因素',5));$result = array();foreach($ar as $v) {    if (array_key_exists($v[0], $result)) $result[$v[0]] += $v[2];    else $result[$v[0]] = $v[2];}print_r($result);