note 93580 added to class.iterator

Here's a Fibonacci example using the formula, rather than addition. <?php /** * @author Anthony Sterling */ class FibonacciSequence implements Iterator { protected $limit = 0; protected $key = 0; public function __construct($limit = 0) { $this->limit = (integer)$limit; } public function current() { return round( (pow(((1 + sqrt(5)) / 2), $this->key) - pow((-1 / (1 + sqrt(5)) / 2), $this->key)) / sqrt(5), null ); } public function key() { return $this->key; } public function next() { $this->key++; } public function rewind() { $this->key = 0; } public function valid() { return $this->key < $this->limit; } } foreach(new FibonacciSequence() as $number) { printf( '%d<br />', $number ); } /* 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711 28657 46368 75025 121393 196418 317811 514229 */ ?> Anthony. ---- Server IP: 64.71.164.2 Probable Submitter: 212.159.198.13 ---- Manual Page -- http://www.php.net/manual/en/class.iterator.php Edit -- https://master.php.net/note/edit/93580 Del: integrated -- https://master.php.net/note/delete/93580/integrated Del: useless -- https://master.php.net/note/delete/93580/useless Del: bad code -- https://master.php.net/note/delete/93580/bad+code Del: spam -- https://master.php.net/note/delete/93580/spam Del: non-english -- https://master.php.net/note/delete/93580/non-english Del: in docs -- https://master.php.net/note/delete/93580/in+docs Del: other reasons-- https://master.php.net/note/delete/93580 Reject -- https://master.php.net/note/reject/93580 Search -- https://master.php.net/manage/user-notes.php