Count number of write operations in the bulk

# MongoDB\Driver\BulkWrite::count

(mongodb >=1.0.0)

MongoDB\Driver\BulkWrite::count — Count number of write operations in the bulk

### 说明

public function MongoDB\Driver\BulkWrite::count(): int

Returns the number of write operations added to the MongoDB\Driver\BulkWrite object.

### 参数

此函数没有参数。

### 返回值

Returns number of write operations added to the MongoDB\Driver\BulkWrite object.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### 更新日志

版本 | 说明
--- | ---
PECL mongodb 1.2.0 | Returns the number of write operations added to the MongoDB\Driver\BulkWrite object. Earlier versions returned the expected number of client-to-server roundtrips required to execute all write operations.

### 示例

示例 #1 MongoDB\Driver\BulkWrite::count() example

    <?php

    $bulk = new MongoDB\Driver\BulkWrite;
    $bulk->insert(['_id' => 1, 'x' => 1]);
    $bulk->insert(['_id' => 2, 'x' => 2]);
    $bulk->update(['x' => 2], ['$set' => ['x' => 1]]);
    $bulk->delete(['x' => 1]);

    var_dump(count($bulk));

    ?>

以上示例会输出：

    int(4)

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