3v4l.org

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<?php $array = [ [4, 3, 5, 7, 210], [4, 9, 5, 7, 210], [4, 9, 25, 7, 210], ]; foreach ($array as &$row) { array_pop($row); $row[] = array_product($row); } var_export($array);

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14.85 ms | 402 KiB | 5 Q