<body>
<form action="" method="get">
<label for="input">Input string: </label>
<input type="text" name="input" id="input"/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>
<?php
function sumDigits($digit)
{
if (!is_numeric($digit)) {
return "I can not sum that";
} else {
$sum = 0;
$digitToString = (string) $digit;
for ($i = 0; $i < strlen($digitToString); $i++) {
$sum += (int) $digitToString[$i];
}
return $sum;
}
}
if (isset($_GET['input'])) {
$inputs = $_GET['input'];
$input = explode(", ", $inputs);
echo "<table border='1'>";
for ($i = 0; $i < count($input); $i++) {
echo "<tr><td> {$input[$i]} </td><td>" . sumDigits($input[$i]) . "</td></tr>";
}
echo "</table>";
}
</form>
</body>
</html>
<?php
if (isset($_GET['submit'])) {
?>
<table>
<tbody>
<?php
$input = explode(', ', $_GET['input']);
foreach ($input as $var) {
echo '<tr>';
echo "<td>{$var}</td>";
echo '<td>' . sumDigits($var) . '</td>';
}
?>
</tbody>
</table>
<?php
}
function sumDigits($num)
{
if (!ctype_digit($num)) {
return 'I cannot sum that';
}
$sum = 0;
while ($num > 0) {
/**
* Recursive function which returns the sum of the digits of a given integer.
*
* @param int $number
* @return int
*/
function sumDigits($number)
{
if ($number == 0) {
return 0;
}
//echo "return ($number % 10) + sumDigits($number / 10)<br>"; //debug info
return $number % 10 + sumDigits($number / 10);
}
<?php
function sumDigits($num, $base = 10)
{
$s = base_convert($num, 10, $base);
foreach (str_split($s) as $c) {
$result += intval($c, $base);
}
return $result;
}
echo sumDigits(1), "\n";
echo sumDigits(12345), "\n";
echo sumDigits(123045), "\n";
echo sumDigits(0xfe, 16), "\n";
echo sumDigits(0xf0e, 16), "\n";
