如何在PHP中使用MongoDB\Driver查询获取find()结果的长度？

use MongoDB\Driver\Manager;
use MongoDB\Driver\Query;

$manager = new Manager("mongodb://localhost:27017");

$filter = []; // 查询条件，可以根据需要设置过滤条件
$options = []; // 查询选项，可以根据需要设置排序、限制等选项
$query = new Query($filter, $options);

$cursor = $manager->executeQuery('database.collection', $query);

$count = $cursor->count();

echo "查询结果的长度：".$count;

use MongoDB\Driver\Manager;
use MongoDB\Driver\Query;

$manager = new Manager("mongodb://localhost:27017");

$filter = [];
$options = [];
$query = new Query($filter, $options);

$cursor = $manager->executeQuery('database.collection', $query);
$count = $cursor->count();

echo "查询结果的长度：".$count;