<?php $old = '{"4":{"deu":1, "eng":1, "fra":1}}'; $new = '{"4":{"deu":1, "eng":2}}'; $oldArray = json_decode($old,true); $newArray = json_decode($new,true); $finalArray =[]; foreach($oldArray as $key=>$value){ $finalArray[$key] = array_merge($value,$newArray[$key]); } print_r($finalArray); echo json_encode($finalArray);
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