PHP+MySQl实现短网址的生成和读取
常规的方案我们将生成好的短网址和原网址对应到一张数据表中,然后供读取使用。我们先来看如何生成唯一的短网址。
//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('https://www.jb51.net/'); //1EeIv2
使用以上PHP代码可以生成唯一的6位的短网址,然后我们将生成的短网址与原网址一起写入到MySQL表中,插入数据库的代码这里我就不写了,这是PHP基础。
接着,我们有一个link.php用来接收读取url并实现真实跳转。
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: ' . $real_url); }else{ header('HTTP/1.0 404 Not Found'); echo 'Unknown link.'; } }else{ header('HTTP/1.0 404 Not Found'); echo 'Unknown link.'; }
代码中,如果得到短网址对应的真实url,会使用header跳转到真实的页面上去,否则返回404代码。这样我们可以使用如: http://yourdomain/link.php?url=xxx来实现短网址访问。
继续,我们使用URL rewrite即重写功能来实现诸如可以通过地址:http://yourdomain/xxx 来访问。
以下是rewrite规则:
#Apache规则: RewriteRule ^/(.*)$ /link.php?url=$1 [L] #如果使用nginx,规则这样写: rewrite ^/(.*)$ /link.php?url=$1 last;
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