javascript - how to generate id no for each json element -

i having json output following. want give incremental id each node , decode. please me.

[{"message":"test+sms","sender":"execut","billcredit":"0.00","messagestatus":"dnd","sendondate":"2015-04-22 15:22:00","provider":"airtel"},{"message":"test+sms","sender":"execut","billcredit":"0.00","messagestatus":"dnd","sendondate":"2015-04-22 15:22:00","provider":"airtel"},{"message":"test+sms","sender":"execut","billcredit":"1.00","messagestatus":"delivrd","sendondate":"2015-04-22 15:22:00","provider":"airtel"},{"message":"test+sms","sender":"execut","billcredit":"1.00","messagestatus":"dnd rejected","sendondate":"2015-04-22 15:22:00","provider":"vodafone"}] 

i want output like

id:1 messagestatus:dnd id:2 messagestatus:dnd id:3 messagestatus:deliverd id:4 messagestatus:dnd 

$json = '[{"message":"test+sms","sender":"execut","billcredit":"0.00","messagestatus":"dnd","sendondate":"2015-04-22 15:22:00","provider":"airtel"},{"message":"test+sms","sender":"execut","billcredit":"0.00","messagestatus":"dnd","sendondate":"2015-04-22 15:22:00","provider":"airtel"},{"message":"test+sms","sender":"execut","billcredit":"1.00","messagestatus":"delivrd","sendondate":"2015-04-22 15:22:00","provider":"airtel"},{"message":"test+sms","sender":"execut","billcredit":"1.00","messagestatus":"dnd rejected","sendondate":"2015-04-22 15:22:00","provider":"vodafone"}] ';  var_dump(json_decode($json)); 

here ids of each objects. cannot post comment it's long.