Weibo short link algorithm php version Weibo link address Weibo send link Weibo send link-PHP Tutorial-php.cn

Weibo short link algorithm php version Weibo link address Weibo send link Weibo send link

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Release： 2016-07-29 08:53:40

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Ideas:
1) Generate a 32-bit signature string from md5 of the long URL, divided into 4 segments, each segment is 8 bytes;
2) Process these four segments in a loop and take 8 bytes, Think of it as a hexadecimal string and 0x3fffffff (30 bits 1) and operate, that is, more than 30 bits are ignored;
3) These 30 bits are divided into 6 segments, and each 5-digit number is used as an index of the alphabet to obtain a specific Characters, proceed in sequence to obtain 6-digit strings;
4) The total md5 string can obtain 4 6-digit strings; any one of them can be used as the short url address of this long url;

The following is PHP code:

Weibo short link algorithm php version Weibo link address Weibo send link Weibo send link

<span>function</span> shorturl(<span>$url</span>='', <span>$prefix</span>='', <span>$suffix</span>=''<span>) {
    </span><span>$base32</span> = <span>array</span><span> (
       </span>'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
       'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
       'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
       'y', 'z', '0', '1', '2', '3', '4', '5'<span>);
 
    </span><span>$hex</span> = <span>md5</span>(<span>$prefix</span>.<span>$url</span>.<span>$suffix</span><span>);
    </span><span>$hexLen</span> = <span>strlen</span>(<span>$hex</span><span>);
    </span><span>$subHexLen</span> = <span>$hexLen</span> / 8<span>;
    </span><span>$output</span> = <span>array</span><span>();
 
    </span><span>for</span> (<span>$i</span> = 0; <span>$i</span> $subHexLen; <span>$i</span>++<span>) {
        </span><span>$subHex</span> = <span>substr</span> (<span>$hex</span>, <span>$i</span> * 8, 8<span>);
        </span><span>$int</span> = 0x3FFFFFFF & (1 * ('0x'.<span>$subHex</span><span>));
        </span><span>$out</span> = ''<span>;
        </span><span>for</span> (<span>$j</span> = 0; <span>$j</span> $j++<span>) {
            </span><span>$val</span> = 0x0000001F & <span>$int</span><span>;
            </span><span>$out</span> .= <span>$base32</span>[<span>$val</span><span>];
            </span><span>$int</span> = <span>$int</span> >> 5<span>;
        }
        </span><span>$output</span>[] = <span>$out</span><span>;
    }
    </span><span>return</span><span>$output</span><span>;
}
 
</span><span>$urls</span> = shorturl('http://www.dareng.com'<span>);
</span><span>var_dump</span>(<span>$urls</span>);

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Weibo short link algorithm php version Weibo link address Weibo send link Weibo send link

Result:

Weibo short link algorithm php version Weibo link address Weibo send link Weibo send link

<span>array</span>(4<span>) {
  [</span>0]=>
  <span>string</span>(6) "alms1l"<span>  [</span>1]=>
  <span>string</span>(6) "2ipmby"<span>  [</span>2]=>
  <span>string</span>(6) "avo1hu"<span>  [</span>3]=>
  <span>string</span>(6) "fdlban"<span>}</span>

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Weibo short link algorithm php version Weibo link address Weibo send link Weibo send link

The above introduces the PHP version of the Weibo short link algorithm, including the content of Weibo short links. I hope it will be helpful to friends who are interested in PHP tutorials.