php生成短网址不重复

//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('//www.jb51.net/'); //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;

> 5; } $output[] = $out; } return $output; } ?>