摘要：在及以前，官方提供了兩個擴展，和，其中是對以等幾個核心類為基礎的類群進行操作，封裝得很方便，所以基本上都會選擇擴展。這種想法很違背簡化操作帶來的語法問題而專注邏輯優化的思路。

使用 PHP+MongoDB 的用戶很多，因為 MongoDB 對非結構化數據的存儲很方便。在 PHP5 及以前，官方提供了兩個擴展，Mongo 和 MongoDB，其中 Mongo 是對以 MongoClient 等幾個核心類為基礎的類群進行操作，封裝得很方便，所以基本上都會選擇 Mongo 擴展。

詳情請見官方手冊：http://php.net/manual/zh/book...

但是隨著 PHP5 升級到 PHP7，官方不再支持 Mongo 擴展，只支持 MongoDB，而 PHP7 的性能提升巨大，讓人無法割舍，所以怎么把 Mongo 替換成 MongoDB 成為了一個亟待解決的問題。MongoDB 引入了命名空間，但是功能封裝非常差，如果非要用原生的擴展，幾乎意味著寫原生的 Mongo 語句。這種想法很違背 ORM 簡化 DB IO 操作帶來的語法問題而專注邏輯優化的思路。

詳情也可參見官方手冊：http://php.net/manual/zh/set....

在這種情況之下，MongoDB 官方忍不住了，為了方便使用，增加市場占有率，推出了基于MongoDB 擴展的庫：https://github.com/mongodb/mo...

該庫的詳細文檔見：https://docs.mongodb.com/php-...

如果使用原驅動的話，大致語法如下：

 "localhost",
            "port" => "27017",
            "username" => "",
            "password" => "",
            "database" => "test"
        ];

    public function __construct($config) {
        $config = array_merge($this->defaultConfig, $config);
        $mongoServer = "mongodb://";
        if ($config["username"]) {
            $mongoServer .= $config["username"] . ":" . $config["password"] . "@";
        }
        $mongoServer .= $config["hostname"];
        if ($config["port"]) {
            $mongoServer .= ":" . $config["port"];
        }
        $mongoServer .= "/" . $config["database"];

        $this->mongodb = new Manager($mongoServer);
        $this->database = $config["database"];
        $this->collection = $config["collection"];
        $this->bulk = new BulkWrite();
        $this->writeConcern = new WriteConcern(WriteConcern::MAJORITY, 100);
    }

    public function query($where = [], $option = []) {
        $query = new Query($where, $option);
        $result = $this->mongodb->executeQuery("$this->database.$this->collection", $query);

        return json_encode($result);
    }

    public function count($where = []) {
        $command = new Command(["count" => $this->collection, "query" => $where]);
        $result = $this->mongodb->executeCommand($this->database, $command);
        $res = $result->toArray();
        $count = 0;
        if ($res) {
            $count = $res[0]->n;
        }

        return $count;
    }

    public function update($where = [], $update = [], $upsert = false) {
        $this->bulk->update($where, ["$set" => $update], ["multi" => true, "upsert" => $upsert]);
        $result = $this->mongodb->executeBulkWrite("$this->database.$this->collection", $this->bulk, $this->writeConcern);

        return $result->getModifiedCount();
    }

    public function insert($data = []) {
        $this->bulk->insert($data);
        $result = $this->mongodb->executeBulkWrite("$this->database.$this->collection", $this->bulk, $this->writeConcern);

        return $result->getInsertedCount();
    }

    public function delete($where = [], $limit = 1) {
        $this->bulk->delete($where, ["limit" => $limit]);
        $result = $this->mongodb->executeBulkWrite("$this->database.$this->collection", $this->bulk, $this->writeConcern);

        return $result->getDeletedCount();
    }
}

這樣的語法和之前差異太大，改動不方便，換 PHP MongoDB 庫

原

new MongoClient();

新

new MongoDBClient();

原

$collention->insert($array, $options);

新

$resultOne = $collention->insertOne($array, $options);//單
$lastId = $resultOne->getInsertedId();
$resultMany = $collention->insertMany($array, $options);//多
$count = $resultMany->getInsertedCount();

原

$collention->update($condition, [
    "$set" => $values
,[
    "multiple" => true//多條，單條false
]);

新

$collection->updateOne(
    ["state" => "ny"],
    ["$set" => ["country" => "us"]]
);
$updateResult = $collection->updateMany(
    ["state" => "ny"],
    ["$set" => ["country" => "us"]]
);
$count = $updateResult->getModifiedCount();

原

$cursor = $collection->find($condition, [
    "name" => true//指定字段
]);
$cursor->skip(5);
$cursor->limit(5);
$cursor->sort([
    "time" => -1
]);

新

$cursor = $collection->find($condition, [
    "skip" => 5,
    "limit" => 5,
    "sort" => [
        "time" => -1
    ],//排序
    "projection" => [
        "name" => 1//指定字段
    ]
]);

原

$collention->remove($condition, [
    "justOne" => false//刪單條
]);
$collention->remove([]);//刪所有

新

$result = $collention->deleteOne($condition, $options);
$collention->deleteMany($condition, $options);

$result->getDeletedCount();

有些人可能習慣以類似 MySQL 的自增 ID 來處理數據，以前可能使用 findAndModify() 方法來查詢并修改：

$collention->findAndModify([
    "_id" => $tableName//我在自增表中用其它的表名作主鍵
], [
    "$inc" => ["id" => 1]//自增
], [
    "_id" => 0
], [
    "new" => 1//返回修改后的結果，默認是修改前的
]);

現在使用 MongoDB 庫的話需要修改為：

$collention->findOneAndUpdate([
    "_id" => $tableName
], [
    "$inc" => ["id" => 1]
], [
    "projection" => ["id" => 1],
    "returnDocument" => MongoDBOperationFindOneAndUpdate::RETURN_DOCUMENT_AFTER
]);

類似的還有 findOneAndDelete() findOneAndReplace()，更多內容可見文檔