<?php function getCombinedSum($digits, $sum) { if(!is_int($digits) || !is_int($sum) || $digits<1 || $sum<0) { throw new InvalidArgumentException('Invalid numeric format'); } if($sum>9*$digits) { throw new LogicException('Sum out of range'); } if($digits==1) { return $sum; } $result = []; for($digit=0; $digit<10; $digit++) { if($sum-$digit>0) { $result[] = $digit.getCombinedSum($digits-1, $sum-$digit)); } else { break; } } return $result; } var_dump(getCombinedSum(3, 4));
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