php - 从对象php中的数组计数数据

Question

我是 php 新手。

当 iprint_r($documents)时，系统会显示：

数组 ( [0] => stdClass Object ( [id] => 1 [title] => "AAA" [summary] => blablabla [score] => 100 [topic] => Technology ) [1] => stdClass Object ( [id] => 2 [title] => "BBB" [summary] => blablabla [score] => 86 [topic] => Food ) [2] => stdClass Object ( [id] => 3 [title ] => "CCC" [summary] => blablabla [score] => 45 [topic] => Technology) [3] => stdClass Object ([id] => 4 [title] => "DDD" [summary] => blablabla [score] => 67 [topic] => Technology ) [4] => stdClass Object ([id] => 5 [title] => "EEE" [summary] => blablabla [score] => 88 [主题] => 技术))

我想计算“主题”并在该对象上找到最高“分数”，所以我有一个结果：

主题“技术”= 4 个文档

主题“食物”= 1 个文档

文档“AAA”中的最高分 = 100

我可以用 foreach 函数做什么？

foreach($documents as $data)
{
    $id = $data->id;
    $title = $data->title;
    $score = $data->score;
    $topic = $data->topic;
}

谢谢你的帮助。

Answer 1

$top   = $documents[0]; // top element (with max score, assume first one as default)
$group = array();       // group buffer to store document count

foreach($documents as $data){
   $topic = $data->topic;

   // if topic in group
   if(isset($group[$topic])){
       $group[$topic]++;   // add one document
   } else { // otherwise
       $group[$topic] = 1; // set one document
   }

   // if $tops's score value is lesser than current $data's value
   if($top->score < $data->score){
       $top = $data; // there is a new top.
   }
}

var_dump($group, $top);

You may aquire any property of $top object. Also you have group count for each topic in $group array.