<?php
/*
* Fibonacci iterator class simply generates Fibonacci numbers.
*/
/**
* Fibonacci iterator.
*
* @author Artur Barseghyan
*/
class Fibonacci implements Iterator {
private $_a;
private $_b;
private $_key;
public function __construct() {
$this->rewind();
}
public function current() {
return $this->_b;
}
public function next () {
$b = $this->_b;
$this->_b = $this->_a + $this->_b;
$this->_a = $b;
++$this->_key;
}
public function key () {
return $this->_key;
}
public function valid () {
return true;
}
public function rewind () {
$this->_a = 0;
$this->_b = 1;
$this->_key = 0;
}
}
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