<?php $rrDatas = [ [ "asset" => 1, "person" => 1, ], [ "asset" => 2, ], ]; $output = []; // Prepare empty output foreach($rrDatas as $inner){ foreach($inner as $key => $value){ $output[$key][] = $value; } } echo json_encode($output); // {"asset":[1,2],"person":[1]}
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