<?php
// An Armstrong number is an n-digit number that is equal to the sum of the n'th powers of its digits.
// e.g. 153
// 3 digits = raise each number to power of 3
// 1^3 + 5^3 + 3^3 => 153
// True
function armstrong_number($s)
{
$val = (int) $s;
$power = strlen($s);
$digits = array_map('intval', str_split($s));
$raised = array_map(function ($i) use($power) {
return pow($i, $power);
}, $digits);
return array_sum($raised) === $val;
}
$filename = strpos($argv[0], 'Matthew\\Dropbox') !== false ? 'data.txt' : $argv[1];
foreach (file($filename) as $line) {
echo (armstrong_number(trim($line)) ? 'True' : 'False') . PHP_EOL;
}
<?php
function armstrong_number($num)
{
$power = strlen($num);
$sum = 0;
$num = (string) $num;
for ($i = 0; $i < $power; $i++) {
$sum = $sum + pow((string) $num[$i], $power);
}
if ((string) $sum == (string) $num) {
return "True";
} else {
return "False";
}
}
$fh = fopen($argv[1], "r");
while (!feof($fh)) {
$test = fgets($fh);
echo armstrong_number(trim($test)) . "\n";
}
fclose($fh);
