function addOne($lgNumStr)
{
$lgNumArr = str_split($lgNumStr);
$lastIndex = count($lgNumArr) - 1;
if ($lgNumArr[$lastIndex] < 9) {
$lgNumArr[$lastIndex]++;
$lgNumArr[$lastIndex] = (string) $lgNumArr[$lastIndex];
$added = implode('', $lgNumArr);
return $added;
} else {
$indexFirstNonNine = getFirstNonNineIndex($lastIndex, $lgNumArr);
$lgNumArr[$indexFirstNonNine]++;
$lgNumArr[$indexFirstNonNine] = (string) $lgNumArr[$indexFirstNonNine];
for ($i = $indexFirstNonNine + 1; $i <= $lastIndex; $i++) {
$lgNumArr[$i] = '0';
}
$added = implode('', $lgNumArr);
return $added;
}
}
function stringAddTwo($num)
{
//get index location of last item in string
$lastNum = strlen($num) - 1;
$finalNum = "";
//turn string into array
$num = str_split($num);
//if the last number is less than nine then simply add 1 and you're done
if ($num[$lastNum] < 9) {
$num[$lastNum]++;
foreach ($num as $digit) {
$finalNum .= $digit;
return $finalNum;
}
//else
} else {
$indexFirstNonNine = getFirstNonNineIndex($num);
$num[$indexFirstNonNine]++;
for ($i = $indexFirstNonNine + 1; $i < count($num); $i++) {
$num[$i] = "0";
}
foreach ($num as $digit) {
$finalNum .= $digit;
return $finalNum;
}
}
}
