<?php $arr1 = [ ['gross_value' => '100', 'quantity' => '1'], ['gross_value' => '200', 'quantity' => '1'] ]; $arr2 = [ ['item_title_id' => '1', 'order_id' => '4'], ['item_title_id' => '2', 'order_id' => '4'] ]; foreach ($arr1 as $i => &$row) { $row = array_merge($row, $arr2[$i]); } var_export($arr1);
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