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<?php function add($overflowsTimes, $augend, $addend){ $sum = $augend + $addend; if(is_float($sum)){ $sum = $addend - (PHP_INT_MAX - $augend); $overflowsTimes++; }elseif($sum < 0){ $sum = PHP_INT_MAX + $sum; $overflowsTimes--; } if($overflowsTimes < 0){ throw new Error(); } return [ $overflowsTimes, $sum ]; } assert(add(0, 0, 0) === [0, 0]); assert(add(0, 100, 200) === [0, 300]); assert(add(0, PHP_INT_MAX - 100, 100) === [0, PHP_INT_MAX]); assert(add(0, PHP_INT_MAX, 100) === [1, 100]); assert(add(0, PHP_INT_MAX, 1000) === [1, 1000]); assert(add(0, PHP_INT_MAX, PHP_INT_MAX) === [1, PHP_INT_MAX]); assert(add(1, 0, 0) === [1, 0]); assert(add(1, 100, 200) === [1, 300]); assert(add(1, PHP_INT_MAX - 100, 100) === [1, PHP_INT_MAX]); assert(add(1, PHP_INT_MAX, 100) === [2, 100]); assert(add(1, PHP_INT_MAX, 1000) === [2, 1000]); assert(add(1, PHP_INT_MAX, PHP_INT_MAX) === [2, PHP_INT_MAX]); assert(add(2, 0, 0) === [2, 0]); assert(add(2, 100, 200) === [2, 300]); assert(add(2, PHP_INT_MAX - 100, 100) === [2, PHP_INT_MAX]); assert(add(2, PHP_INT_MAX, 100) === [3, 100]); assert(add(2, PHP_INT_MAX, 1000) === [3, 1000]); assert(add(2, PHP_INT_MAX, PHP_INT_MAX) === [3, PHP_INT_MAX]); try{ add(0, PHP_INT_MAX, PHP_INT_MIN); }catch(Throwable $e){} print_r(add(1, PHP_INT_MAX, PHP_INT_MIN));