$stmt->rowCount doesn't use actual results

When creating a mocked select result from an array, the rowCount stays at 0. e.g.

$p->mock($query, [['id' => 1],['id' => 2],['id' => 3]]);
$stmt = $p->query($query);
echo $stmt->rowCount(); // Outputs 0, expected 3

Assuming I'm not just doing something wrong, I'd be happy to submit a PR for this, though it'd be helpful to be pointed in the right direction 😃

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