合并二维数组，并计算重复字段的平均值

 1 <?php
 2 $arrs = Array (
 3     Array ( ‘rname‘ => ‘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 "<pre>";
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