<?php $array1 = [ [ "total_process_per_category" => "6", "category_id" => "1" ], [ "total_process_per_category" => "2", "category_id" => "2" ] ]; $array2 = [ [ "total_pinned_per_category" => "16", "category_id" => "1" ], [ "total_pinned_per_category" => "4", "category_id" => "2" ] ]; var_export( array_values( array_reduce( array_merge($array1, $array2), function ($result, $row) { $result[$row['category_id']] = ($result[$row['category_id']] ?? []) + $row; return $result; }, [] ) ) );
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Value for `_results` contains invalid data `array`