PHP generated short URL principle and code

Source: Internet
Author: User
Tags chr crc32 sprintf

The original URL to do CRC32 check, get the check code, using sprintf officers transferred Guevara check code into unsigned numbers, detailed steps please see this article

PHP generated Short URL principle: 1. The original URL do crc32 check, get the check code.    2. Use sprintf ('%u ') officers transferred Guevara code to convert to unsigned digits. 3.62 Operations for unsigned digits (uppercase and lowercase + digits equal to 62 digits), the remainder is mapped to 62 characters, and the mapped characters are saved.    (for example, the remainder is 10, the mapped character is a,0-9 corresponds to the 0-9,10-35 corresponding to the a-z,35-62 A-Z) 4. Circular operation until the value is 0.    5. All mapped characters are spliced, which is the code after the short URL. Code as follows: The code is as follows:/** generates a short URL * @param string $url the original URL * @return string/function DWZ ($url) {$code = sprintf ('%u ', CRC32    ($url));    $surl = ';  while ($code) {$mod = $code% 62;  if ($mod >9 && $mod <=35) {$mod = Chr ($mod + 55);  }elseif ($mod >35) {$mod = Chr ($mod + 61);  $surl. = $mod;  $code = Floor ($code/62);    return $surl; }
Related Article

E-Commerce Solutions

Leverage the same tools powering the Alibaba Ecosystem

Learn more >

Apsara Conference 2019

The Rise of Data Intelligence, September 25th - 27th, Hangzhou, China

Learn more >

Alibaba Cloud Free Trial

Learn and experience the power of Alibaba Cloud with a free trial worth $300-1200 USD

Learn more >

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.