<?php
function nextNumber($n)
{
$len = strlen($n);
$sum = 0;
for ($i = 0; $i < $len; $i++) {
$sum += $n[$i] * $n[$i];
}
return $sum . "";
}
function isHappy($n)
{
$soFar = array();
while ($n != 1 && !in_array($n, $soFar)) {
$soFar[] = $n;
$n = nextNumber($n);
}
return $n == 1;
}
foreach (file($argv[1]) as $line) {
$number = trim($line);
echo isHappy($number) ? 1 : 0;
echo "\n";
}
<?php
function isHappy($n)
{
while (1) {
$total = 0;
while ($n > 0) {
$total += pow($n % 10, 2);
$n /= 10;
}
if ($total == 1) {
return true;
}
if (array_key_exists($total, $past)) {
return false;
}
$n = $total;
$past[$total] = 0;
}
}
$i = $cnt = 0;
while ($cnt < 8) {
if (isHappy($i)) {
echo "{$i} ";
$cnt++;
}
$i++;
}
