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<?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 += $arr2[$i]; } var_export($arr1);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'gross_value' => '100', 'quantity' => '1', 'item_title_id' => '1', 'order_id' => '4', ), 1 => array ( 'gross_value' => '200', 'quantity' => '1', 'item_title_id' => '2', 'order_id' => '4', ), )

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