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php实现的短网址算法示例分享 - 站长搜索
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php实现的短网址算法示例分享

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2015-01-02 05:24:03 转载来源: 网络整理/侵权必删

本文是一个php实现的短网址算法,理论上支持1,073,741,824个短网址,个人使用足够了,需要的朋友可以参考下 每个网址用6个字符代替,(6^32) 最多可以拥有1,073,741,824个短网址。 当然,你还可以记录更详细的信息,如访问记录,创建时间等

本文是一个php实现的短网址算法,理论上支持1,073,741,824个短网址,个人使用足够了,需要的朋友可以参考下

每个网址用6个字符代替,(6^32) 最多可以拥有1,073,741,824个短网址。
当然,你还可以记录更详细的信息,如访问记录,创建时间等。
如果真不够用了,还可以删掉很久不用的。


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;
}

测试代码:


$input = 'http://www.phperz.com/1';
$output = shorturl($input);
 
echo "Input  : $inputn";
echo "Output : {$output[0]}n";
echo "         {$output[1]}n";
echo "         {$output[2]}n";
echo "         {$output[3]}n";
echo "n";
 
$input = 'http://www.phperz.com/2';
$output = shorturl($input);
 
echo "Input  : $inputn";
echo "Output : {$output[0]}n";
echo "         {$output[1]}n";
echo "         {$output[2]}n";
echo "         {$output[3]}n";
echo "n";

输出:


Input : http://www.phperz.com/1
Output : h0xg4r
bdr3tw
osk2d3
4azfqa
 
Input : http://www.phperz.com/2
Output : tm5kxb
ceoj2s
yw3dvl
nrmrxl

标签: php 实现 网址 算法 示例 分享


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