本文共 1417 字，大约阅读时间需要 4 分钟。

require_once ('../Config.class.php'); // $mongo = new Mongo(Config::MONGO_CONNECTION_STR); $mongo->setSlaveOkay(true); $db = null; if (!empty($mongo)){ $db = $mongo->selectDB(Config::MONGO_CONNECTION_DB_NAME); } $collection = null; if (empty($db)) { echo "db null"; exit(); } else { $collection = $db->CategoryModel; } /*$collection->insert(array("category" => "fruit", "age" => 1, "name1" => "apple1")); $collection->insert(array("category" => "fruit", "age" => 2,"name1" => "apple1")); $collection->insert(array("category" => "fruit", "age" => 3,"name1" => "apple1")); $collection->insert(array("category" => "veggie", "age" => 4,"name1" => "apple1")); $collection->insert(array("category" => "veggie", "age" => 5,"name1" => "apple1"));*/ $keys = array("category" => 1); $initial = array("items" => array(),"index"=>-1,"total"=>0); $reduce = "function (obj, prev) { prev.total++;if(obj.age == 2){ prev.index=prev.items.length+1;} if(prev.items.length < 2){ prev.items.push(obj); } var arr = prev.items;if(arr.length > 0) { for(var i=0;i<arr.length;i++){ for(var j=0;j<arr.length-i-1;j++){ if(arr[j].age < arr[j + 1].age){ var temp = arr[j]; arr[j] = arr[j + 1]; arr[j + 1] = temp;} } } if(arr.length>2){ arr = arr.slice(0,2); } } }"; //$condition = array("category" => array( '$in' => array("fruit"))); $g = $collection->group($keys, $initial, $reduce); print_r($g); // demo写的比较乱，，自己整理一下就能看明白，，限制返回分组显示条数，进行冒泡排序需要字段

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