PHP iterator implements the Fibonacci series Function _ PHP

Source: Internet
Author: User
The Fibonacci series is usually implemented using recursion, and there are other methods. It is now commercially available. it is almost no difficulty to use the PHP iterator to implement a Fibonacci series, just to rewrite the next () method in the class. Annotations have been written into the code, which is quite reasonable. 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 (){
Return $ this-> key;
}

Public function next (){
// The key is here
// Save the current value to $ newprevious
$ Newprevious = $ this-> current;
// Assign the sum of the previous value and current value to the current value
$ 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 maid;
$ I = 0;
Foreach ($ seq as $ f ){
Echo "$ f ";
If ($ I ++ = 15) break;
}

Program running result:
The code is as follows:
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.