How to get cursor result count using the MongoDB PHP extension

问题

The mongo PHP extension is deprecated in favour of the mongodb extension. This extension is used together with the mongo-php-library.

In the old extension one could get the result count from the cursor using MongoCursor::count(). However, the new cursor MongoDB\Driver\Cursor has no such method. What is the new way of getting the number of results from after performing a query against MongoDB?

回答1:

I use this code.

$query = ["hello" => "world"];
$command = new MongoDB\Driver\Command(["count" => "collection", "query" => $query]);
try {
    $result = $mongo->executeCommand("mydb", $command);
    $res = current($result->toArray());
    $count = $res->n;
    echo $count;
} catch (MongoDB\Driver\Exception\Exception $e) {
    echo $e->getMessage(), "\n";
}

回答2:

You can do it like this

Model::count(array($whereClause));

The $whereClause would be your search criteria basically.

Otherwise, if your query returns an array, you could do

$data = Model::find(array($whereClause));
$total = count($data);

来源：https://stackoverflow.com/questions/36726069/how-to-get-cursor-result-count-using-the-mongodb-php-extension