Using PHP iterators to implement a Fibonacci sequence _php tutorial

Source: Internet
Author: User
The Fibonacci sequence is usually done recursively, and of course there are other methods. This is now learning to sell, using a PHP iterator to implement a Fibonacci sequence, with little difficulty, just rewrite the next () method in the class. Comments have been written into the code and are quite well understood.

  Current;     }         Public Function key () {         return $this->key;     }         Public function Next () {//Key here//Save the current value to  $newprevious        $newprevious = $this->current;//assigns the previous value and the current value to the current value c9/> $this->current + = $this->previous; The previous current value is assigned 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 + = = = =) break;} ?>

Program Run Result:

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 true techarticle The Fibonacci sequence is usually done recursively, and of course there are other methods. Here is now learning to sell, with the PHP iterator to achieve a Fibonacci sequence, almost no difficulty, ...

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