<?php $array = [ [ ["ID" => 2, "vendor_id" => "37", "order_id" => 776], ], [ ["ID" => 2, "vendor_id" => "37", "order_id" => 786], ] ]; var_export( array_reduce( $array, function ($carry, $group) { foreach ($group as $row) { $carry[$row['order_id']][] = $row; } return $carry; } ) );
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