php - Return nested keys in mongodb -

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i'm tying nested keys mongodb record structured :

{     "_id" : objectid("ju5ts0m3h4shf0r3x4mpl3"),     "statuses" : {         "f1r5t1d1n33dt0f1nd" : {             "ko status" : [...],             "ok status" : [...]         },         "s3c0nd1d1n33dt0f1nd" : {             "ko status" : [...],             "ok status" : [...]         },         "th1rd1d1n33dt0f1nd" : {             "ko status" : [...],             "ok status" : [...]         } }

the output expect :

[     "f1r5t1d1n33dt0f1nd",     "s3c0nd1d1n33dt0f1nd",     "th1rd1d1n33dt0f1nd", ]

i need ids only, because under "ok status" , "ko status" large amounts of data, impact performance.

i searched through mongo doc , so, found nothing.

how query php mongoclient and/or plain mongodb queries ? it possible ?

try use array_keys() like,

$status = array_keys($obj['statuses']);

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