Short URL Algorithm Sharing Based on php

Each URL is replaced by 6 characters, and (6 ^ 32) can have up to 1,073,741,824 short URLs.
Of course, you can also record more detailed information, such as access records, creation time and so on.
If it is really not enough, you can delete those that have not been used for a long time.

function shorturl($input) {

  $base32 = 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 .= $base32[$val];

      $int = $int >> 5;

    }

 

    $output[] = $out;

  }

 

  return $output;

}

Test code:

$input = 'https://www.ofstack.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 = 'https://www.ofstack.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 : https://www.ofstack.com/1

Output : h0xg4r

bdr3tw

osk2d3

4azfqa

 

Input : https://www.ofstack.com/2

Output : tm5kxb

ceoj2s

yw3dvl

nrmrxl