count mongodb in php -

i have collection user has 2 parameters (username,paid), username string , paid string too, should count how many users parameter paid="true"

this try

<?php  $connection = new mongoclient(); $collection = $connection->ahmed->user;  $cursor = $collection->find(); var_dump($collection->count()); var_dump($collection->count($cursor->paid=>"true"))); ?> 

if there expert in mongo help, :)

the new driver not implement $cursor->count() use $collection->count() instead

$collection->count($filter) 

in case: $filter = array('paid' => 'true')