//生成短网址 
function code62($x){ 
  $show=''; 
  while($x>0){ 
    $s=$x % 62; 
    if ($s>35){ 
      $s=chr($s+61); 
    }elseif($s>9&&$s<=35){ 
      $s=chr($s+55); 
    } 
    $show.=$s; 
    $x=floor($x/62); 
  } 
  return $show; 
} 
function shorturl($url){ 
  $url=crc32($url); 
  $result=sprintf("%u",$url); 
  return code62($result); 
} 
echo shorturl('http://www.1sucai.cn/'); 
//1EeIv2 

include_once('connect.php'); //连接数据库 
$url = $_GET['url']; 
if(isset($url) && !empty($url)){ 
  $sql = "select url from shorturl where codeid='$url'"; 
  $query = mysql_query($sql); 
  if($row=mysql_fetch_array($query)){ 
    $real_url = $row['url']; 
    header('Location: ' . $real_url); 
  }else{ 
    header('HTTP/1.0 404 Not Found'); 
    echo 'Unknown link.'; 
  } 
}else{ 
  header('HTTP/1.0 404 Not Found'); 
  echo 'Unknown link.'; 
} 

#Apache规则： 
RewriteRule ^/(.*)$ /link.php?url=$1 [L] 
 
#如果使用nginx，规则这样写： 
rewrite ^/(.*)$ /link.php?url=$1 last; 

baidu  = https://www.baidu.com/ 
qq    = http://www.qq.com/ 
hw    = http://www.hw.com/ 
dm    = http://www.dm.com/view-blog-362.html 

$links = parse_ini_file('links.ini'); 
 
if(isset($_GET['l']) && array_key_exists($_GET['l'], $links)){ 
  header('Location: ' . $links[$_GET['l']]); 
} 
else{ 
  header('HTTP/1.0 404 Not Found'); 
  echo 'Unknown link.'; 
} 

#Apache规则： 
RewriteRule ^/(.*)$ /index.php?l=$1 [L] 
 
#如果使用nginx，规则这样写： 
rewrite ^/(.*)$ /index.php?l=$1 last; 

<?php
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++) {
//把加密字符按照8位一组16进制与0x3FFFFFFF(30位1)进行位与运算
$subHex = substr ($hex, $i * 8, 8);
$int = 0x3FFFFFFF & (1 * ('0x'.$subHex));
$out = '';
 
for ($j = 0; $j < 6; $j++) {
 
//把得到的值与0x0000001F进行位与运算，取得字符数组chars索引
$val = 0x0000001F & $int;
$out .= $base32[$val];
$int = $int >> 5;
}
 
$output[] = $out;
}
 
return $output;
}
?>