Convert MongoDB console aggregate to php with array -

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i failing convert following mongodb console command:

db.customers.aggregate( [ { $group : {     _id: {         year : { $year: "$since" },                 month : { $month: "$since" }     },     count: { $sum: 1 } } }] );

which works php 

$customers->aggregate(array(     '$group' => array(         '_id' => array( 'year' => array('$year' => '$since'),                         'month' => array('$month' => '$since')             )         ),         array(             'count' => array( '$sum' => 1 )             ),         )     );

which returns exception: pipeline stage specification object must contain 1 field. tried '"$since"' no luck

the count field must part of group.

$customers->aggregate(array(     '$group' => array(         '_id' => array( 'year' => array('$year' => '$since'),                         'month' => array('$month' => '$since')             ),          'count' => array( '$sum' => 1 )         )     ));

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