背景和需求

就好比说页面导航的左侧是分类，分类下面有很多链接。我现在想统计所有分类下面点击次数最多的一个，并把其颜色做特殊处理！

大致的数据结构如下：

{
  "content": [
    {
      "id": "1",
      "name": "htmldrive",
      "url": "http://www.htmldrive.net/",
      "cate": "前端开发",
      "clickpoint": "100"
    },
    {
      "id": "2",
      "name": "17素材网",
      "url": "http://www.17sucai.com/",
      "cate": "前端开发",
      "clickpoint": "151"
    },
    {
      "id": "3",
      "name": "阿里妈妈图标库",
      "url": "http://www.iconfont.cn/",
      "cate": "前端开发",
      "clickpoint": "2"
    },
    {
      "id": "53",
      "name": "Animate.css",
      "url": "http://www.haorooms.com/uploads/example/Animatecss/",
      "cate": "前端开发",
      "clickpoint": "21"
    },
    {
      "id": "55",
      "name": "Dafont",
      "url": "http://www.dafont.com/",
      "cate": "字体",
      "clickpoint": "1"
    }
 ]
}

方法和思路

最好的处理方式是在后端PHP中对齐进行处理。

思路：我们可以创建一个新的过渡数组，对原来的数组进行循环，创建一个分类的数组，然后把点击次数中的最大值和ID放到这个数组中。通过比较，获取分类中点击次数最多的ID和点击次数，然后把这个次数最多的ID放在一个新的数组中，循环原来的数据，通过inarray(),函数判断次数最多的ID是不是在这个数组当中，是的话，就给数据增加一个标示字段1，不是的话就是0。那么标示字段为1的就是分类中点击次数最多的。

调整之后输出的json是：

 {
    "content": [
      {
        "id": "1",
        "name": "htmldrive",
        "url": "http://www.htmldrive.net/",
        "cate": "前端开发",
        "clickpoint": "100",
       "max": 0
      },
      {
        "id": "2",
        "name": "17素材网",
        "url": "http://www.17sucai.com/",
        "cate": "前端开发",
        "clickpoint": "151",
        "max": 1
      },
      {
        "id": "3",
        "name": "阿里妈妈图标库",
        "url": "http://www.iconfont.cn/",
        "cate": "前端开发",
        "clickpoint": "2",
        "max": 0
      },
      {
        "id": "53",
        "name": "Animate.css",
        "url": "http://www.haorooms.com/uploads/example/Animatecss/",
        "cate": "前端开发",
        "clickpoint": "21",
        "max": 0
      },
      {
        "id": "55",
        "name": "Dafont",
        "url": "http://www.dafont.com/",
        "cate": "字体",
        "clickpoint": "1",
        "max": 0
      }
   ]
  }

php的代码如下：

  $sql = "select id,name,url,cate,clickpoint from commonwebsite order by id asc ";
  $res= $db->getAll($sql);
  $temp_arr = array();
  foreach ($res as $key => $value) {
  if(!isset($temp_arr[$value['cate']])){
   $temp_arr[$value['cate']] = array();
   $temp_arr[$value['cate']]['max'] = $value['clickpoint'];
   $temp_arr[$value['cate']]['id'] = $value['id'];
  }else{
   if($value['clickpoint']>$temp_arr[$value['cate']]['max']){
    $temp_arr[$value['cate']]['max'] = $value['clickpoint'];
    $temp_arr[$value['cate']]['id'] = $value['id'];
   }
  }
  }
 $temp_id = array(); //创建一个存放ID的临时数组
  foreach ($temp_arr as $val) {//循环之前创建的临时数组，存放分类和最多点击次数的
  $temp_id[] = $val['id']; //将点击次数最多的ID赋值给了临时数组
  }
   foreach ($res as $key => $vals) { //循环原来的数据
   if(in_array($vals['id'], $temp_id)){//如果次数最多的ID在原来的数组的ID中，那个加一个字段max并设置其值为1
    $res[$key]['max'] =1;
   }else{
    $res[$key]['max'] =0;//否则不是点击次数最多的，设置为0
   }
  }
  $result['content'] = $res;
    die(json_encode($result)); //json输出
  exit();