1 
      '小麦', 'm1'=> 12.00 ,'m2'=> 33,'qq'=> 33  ) , 4     Array ( 'rname' => '小麦', 'm1' => 23.00,'m2'=> 44,'qq'=> 11 ) , 5     Array ( 'rname' => 'ccc', 'm1' => 11,'m2'=> 22,'qq'=> 12 )  6 ); 7  8 //计算出重复字段出现的次数 9 $b=array();10 foreach($arrs as $v){11     $b[]=$v['rname'];12 }13 $c=array_unique($b);14 foreach($c as $v){15     $n=0;16     foreach($arrs as $t){17         if($v==$t['rname'])18             $n++;19     }20     $d[]['nn']=$n;21     22 }23 24 //合并数组中重复的值，并进行加计算25 $tmpval=array();26 $data=array();27 $i=0;28 //遍历原数据29 foreach($arrs as $key=>$arr){30     31     if(!empty($tmpval) && array_key_exists($arr['rname'],$tmpval)){32         //存在33         $key=$tmpval[$arr['rname']];34        35         $data[$key]['m1']+=$arr['m1'];36         37         $data[$key]['m2']+=$arr['m2'];        38     }else{39         //不存在40         $tmpval[$arr['rname']]=$i;41         $data[$i++]=$arr;42     }43 }44 45 //把2个二维数组合并成一个二维数组46 $zuizhong = array();47 foreach($data as $k=>$r){48     $zuizhong[] = array_merge($r,$d[$k]);49 }50 51 //计算出平均值52 $datas = array();53 foreach($zuizhong as $key=>$arr){    54     $datas[$key]['rname'] = $arr['rname'];55     $datas[$key]['m1'] = $arr['m1']/$arr['nn'];    56     $datas[$key]['m2'] = $arr['m2']/$arr['nn'];57 } 58 59 echo "
";60 print_r($d);61 print_r($data); 62 print_r($zuizhong); 63 print_r($datas);

http://www.cnblogs.com/losesea/archive/2013/06/14/3134900.html