PHP 实现短域名互转

 1 /**
 2  * 短域名生成&解析类
 3  */
 4 class Build_URL {
 5 
 6     private $mem;
 7     private $base_url = 'http://xxx.com/';
 8 
 9     public function  __construct() {
10         $mem_conf    = array(
11                 array(
12                         'host'    => '192.168.10.90',
13                         'port'    => '11116'
14                 ),
15                 array(
16                         'host'    => '192.168.10.90',
17                         'port'    => '11117'
18                 ),
19         );
20         $this->mem    = new Memcache();
21         foreach ($mem_conf as $v) {
22             $this->mem->addServer($v['host'], $v['port']);
23         }
24     }
25 
26     public function encode($url) {
27         $url    = trim($url);
28         if(!preg_match("#^[http://|https://|ftp://]#iS", $url)) {
29             return false;
30         }
31         $md5    = md5($url);
32         $aid    = $this->mem->get($md5);
33         if(!$aid) {
34             if(($aid = $this->mem->increment('auto_increment_id')) === false) {
35                 $this->mem->set('auto_increment_id', 10000);
36                 $aid = $this->mem->increment('auto_increment_id');
37             }
38             $this->mem->set($md5, $aid);
39             $key    = $this->dec2any($aid);
40             $this->mem->set($key, $url);
41         } else {
42             $key    = $this->dec2any($aid);
43         }
44 
45         return $this->base_url.$key;
46     }
47 
48     public function decode($url) {
49         $key    = str_replace($this->base_url, '', trim($url));
50         return $this->mem->get($key);
51     }
52 
53     private function dec2any($num, $base=62, $index=false) {
54         $out = '';
55         if (! $base ) {
56             $base = strlen($index);
57         } else if (! $index ) {
58             $index = substr("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" ,0 ,$base);
59         }
60         $t = ($num == 0) ? 0 : floor(log10($num) / log10($base));
61         for ($t; $t >= 0; $t--) {
62             $a = floor($num / pow( $base, $t ));
63             $out = $out . substr($index, $a, 1);
64             $num = $num - ($a * pow( $base, $t ));
65         }
66         return $out;
67     }
68 }
69 
70 $app = new Build_URL();
71 $url = array(
72     'http://www.baidu.com',
73     'http://www.google.com',
74     'http://edu.cnblogs.com'
75 );
76 foreach ($url as $v) {
77     $sort    = $app->encode($v);
78     echo "sort link: ".$sort."\n";
79     $original    = $app->decode($sort);
80     echo "original: ".$original."\n";
81 }
82 ?>