php - Get an average number for multiple embedded documents MongoDB -


i working highcharts make drilldown chart. display multiple projects, average value , drilldown in columns every value. problem is, can't average number per projects.. json mongo looks this: 

{     "_id" : objectid("57f4dd6c45db428df9a5541b"),     "id" : 68,     "project_code" : 13110202,     "samples" : [                 {                         "sample_name" : "1678_2",                         "perc" : "75.97"                 },                 {                         "sample_name" : "2012_1b-5",                         "perc" : "75.33",                 },                 {                         "sample_name" : "2012_1b-8",                         "perc" : "77.28",                                  }] },    {     "_id" : objectid("57f4dd6c45db428df9a5541a"),     "id" : 70,     "project_code" : 1235125,     "samples" : [                 {                         "sample_name" : "ben",                         "perc" : "30.97"                 },                 {                         "sample_name" : "anna",                         "perc" : "81.25",                 },                 {                         "sample_name" : "sarah",                         "perc" : "80.23",                                  }] },

i trying through document, through embedded document samples, perc_mapped values, calculate average , put in json used highchart. code have now: 

foreach ($id_array $char) {             $cursor = $collection->find(array("_id" => new mongoid($char)));             foreach ($cursor $document) {                 if (is_array($document['samples'])) {                     foreach ($document['samples'] $samples) {                         array_push($perc_total, $samples['perc']);                         $average_of_foo = array_sum($perc_total) / count($perc_total);                     }                 }             }         }          var_dump($average_of_foo);              foreach ($id_array $char) {             $cursor = $collection->find(array("_id" => new mongoid($char)));             foreach ($cursor $document) {                 if (is_array($document['samples'])) {                     foreach ($document['samples'] $samples) {                         $array =                             array("name" => $document['project_code'],                               // here add average                                 "y" => (float) $samples['perc'],                                 "drilldown" => $char                             );                         array_push($array_data, $array);                     }                 }             }         }


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