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<?php $firstArray = [ //j=0, j=1 [ 3, 2, 4], // $i = 0 [ 4, 6, 7] // $i = 1 ]; $secondArray = [ [7, 8, 4], [2, 6, 9] ]; $total = []; for($i = 0; $i < sizeof($firstArray); $i++){ for($j = 0; $j < sizeof($firstArray[$i]); $j++){ $total[$i][$j] = $firstArray[$i][$j] + $secondArray[$i][$j]; } } for($i = 0; $i < count($total); $i++){ for($j = 0; $j < count($total[$i]); $j++){ echo $total[$i][$j]; if($j != sizeof($total[$i]) - 1){ echo ", "; } } echo PHP_EOL; }