php实现水仙花

class Armstrong {

static function index(){

for ( $i = 100; $i < 100000; $i++ ) {

echo self::is_armstrong($i) ? $i . '
' : '';

}

}

static function is_armstrong($num){

$s = 0;

$k = strlen($num);

$d = str_split($num);

foreach ($d as $r) {

$s += bcpow($r, $k);

}

return $num == $s;

}

}

Armstrong::index();

?>