Mongodb PHP根据特定字段查找行数

Question

I am trying to display the count of items based on a category for a specific user email. This is my PHP code for the following

$email = $_SESSION['loggedInUserEmail'];

//Connect to MongoDB
$mongoClient = new MongoClient();

//Select a database
$db = $mongoClient->finchest;

$CheckEmail = [
    "CustEmail" => $email,
];


$collection = $db->History;

$Criteria = array("Category" => "Fish Skins");
$returnVal = $collection->find($CheckEmail)->count($Criteria);
echo $returnVal;

This code gives me the following error

Warning: MongoCursor::count() expects parameter 1 to be boolean, array given in C:\www\FinChest\PHPecommend.php on line 89

Please help me solve it, THANKS A TON.