仿微博php生成短网址

html code

<!DOCTYPE html>  
<html lang="en">  
<head>  
  <meta charset="utf-8" />  
  <title>urlShort</title>  
</head>  
  
<body>  
  <form action="urlShort.php" method="post">  
    <input type="text" size="16" name="url" value="输入网址" onfocus="if(this.value==\'输入网址\'){this.value=\'\';}" onblur="if(this.value==\'\'){this.value=\'输入网址\'};">  
    <input type="submit" value=" 生成 " />  
  </form>  <a href="http://hovertree.com">何问起</a>
</body>  
</html>

php code

<?php  
     header("Content-Type:text/html;charset=UTF-8");    
     function base62($x){  
        $show = \'\';  
        while($x>0){  
            $s = $x % 62;  
            if ($s > 35){  
                $s = chr($s + 61);  
            }else if ($s > 5 && $S<=35){  
                $s = chr($s + 55);  
            }  
            $show .= $s;  
            $x = floor($x/62);  
        }  
        return $show;  
    }  /* 何问起 hovertree.com */
      
    function url_short($url){  
        $url = crc32($url);  
        $result = sprintf("%u",$url);   
        return base62($result);  
    }  
      
    echo ("生成的新网址为：<a href=\'http://$_POST[url]\'>".url_short($_POST[\'url\'])."</a>");  
?>