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<?php $a = [[1,2], [3,4,4], [9,8,4,7,6], [14,27,39]]; $b = 0; for ($i = 0; $i < sizeof($a); $i++) { for ($j = 0; $j < sizeof($a[$i]); $j++) { $b += $a[$i][$j]; } } echo $b;
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