FibonnaciSequence class and PhiApproximator class

fibonnaci.php

<?php
	
	class FibonnaciSequence implements Iterator {
		private $index = 0;
		protected $oldnum = 0;
		private $currnum = 1;
		private $nextnum = 1;
		public function current() {
			return $this->currnum;
		}
		public function next() {
			$this->nextnum = $this->currnum + $this->oldnum;
			$this->oldnum = $this->currnum;
			$this->currnum = $this->nextnum;
			$this->index++;
		}
		public function key() {
			return $this->index;
		}
		public function valid() {
			return true;
		}
		public function rewind() {
			$this->index = 0;
			$this->oldnum = 0;
			$this->currnum = 1;
			$this->nextnum = 1;
		}
	}
	
/*
	$j = 0;
	foreach (new FibonnaciSequence() as $idx => $i) {
		printf("%u: %f, \n", $idx, $i);
		if ($idx == 10) break;
	}
*/
	
	class PhiApproximator extends FibonnaciSequence {
		private $approximation = 0;
		public function current() {
			return $this->approximation;
		}
		public function next() {
			parent::next();
			$this->approximation = bcdiv(sprintf("%f", parent::current()), sprintf("%f", ($this->oldnum == 0 ? 1 : $this->oldnum)), 10000);
		}
		public function rewind() {
			parent::rewind();
			$this->approximation = 0;
		}
	}
	
	$j = 0;
	foreach (new PhiApproximator() as $idx => $i) {
		printf("%u: %01.40f\n", $idx, $i);
		if ($idx == 1475) break;
	}
?>