Online PHP editor | refs for e3ERO

<?php $source=json_decode('[{"title":"games","transaction_id":102,"order_id":"a"},{"title":"media","transaction_id":95,"order_id":"b"},{"title":"tv","transaction_id":102,"order_id":"a"},{"title":"jane","transaction_id":42,"order_id":"a"},{"title":"ads","transaction_id":95,"order_id":"b"},{"title":"movie","transaction_id":95,"order_id":"c"}]',true); function merge(array $source) { $result=array(); foreach($source as $node) { $key=$node["transaction_id"]."_".$node["order_id"]; if(!empty($result[$key])) $result[$key][]=$node["title"]; else $result[$key]=array($node["title"]); } return array_values($result); } print_r($source);//Just for debug print_r(merge($source));