PHP iterator implements the function of Fibonacci sequence_PHP tutorial

Copy code The code is as follows:

class Fibonacci implements Iterator {
private $previous = 1;
private $current = 0;
private $key = 0;

public function current() {
return $this->current;
}

public function key () {
                                                                                                                                                            """""""""""""""
$newprevious = $this->current;
// Assign the sum of the previous value and the current value to the current value
$this->current += $this->previous;
// Assign the previous current value to the previous value
$this->previous = $newprevious;
$this->key++;
}

public function rewind( ) {
$this->previous = 1;
$this->current = 0;
$this->key = 0;
}

public function valid() {
     return true;
  }
}

$seq = new Fibonacci;
$i = 0;
foreach ($seq as $f) {
echo "$f "; if ($i++ === 15) break;

}


Program execution result:

Copy code

The code is as follows:

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610

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truehttp: //www.bkjia.com/PHPjc/825140.htmlTechArticleCopy the code code as follows: class Fibonacci implements Iterator { private $previous = 1; private $current = 0; private $ key = 0; public function current() { return $this-current; }...