PHP Short URL Algorithm example code sharing _php Tutorial

PHP implements a short URL algorithm that theoretically supports 1,073,741,824 short URLs.

Each URL is replaced by 6 characters, and (6^32) can have a maximum of 1,073,741,824 short URLs.
Of course, you can also record more detailed information such as access history, creation time, etc.
If it is not enough, it can also be deleted for a long time.

functionShorturl ($input) {$base=Array (' 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 ');$hex=MD5($input);$hexLen=strlen($hex);$subHexLen=$hexLen/8;$output=Array(); for($i= 0;$i<$subHexLen;$i++) {$subHex=substr($hex,$i* 8, 8);$int= 0X3FFFFFFF & (1 * (' 0x ').$subHex));$out= ''; for($j= 0;$j< 6;$j++) {$val= 0x0000001F &$int;$out.=$base[$val];$int=$int>> 5;}$output[] =$out;}return $output;}

Test code:

  $input  = ' http://www.jbxue.com/1 ' ;   $output  = Shorturl ( $input  );   Echo  "Input:  $input  \ n" ;   Echo  "Output: { $output  [0]}\n" ;   Echo  "{ $output  [1]}\n" ;   Echo  "{ $output  [2]}\n" ;   Echo  "{ $output  [3]}\n" ;   Echo  "\ n" ;   $input  = ' http://www.jbxue.com/2 ' ;   $output  = Shorturl ( $input  );   Echo  "Input:  $input  \ n" ;   Echo  "Output: { $output  [0]}\n" ;   Echo  "{ $output  [1]}\n" ;   Echo  "{ $output  [2]}\n" ;   Echo  "{ $output  [3]}\n" ;   Echo  "\ n"; 

Output:

Input:http://www.jbxue.com/1
output:h0xg4r
Bdr3tw
Osk2d3
4azfqa

Input:http://www.jbxue.com/2
Output:tm5kxb
Ceoj2s
Yw3dvl
Nrmrxl

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