php基于tp5.1 实现短链接功能 (redis+nginx)

来源：cnblogs　　作者：also_think　　时间：2020/11/9 16:11:52　　对本文有异议

生成及存储短链接

// 生成短链接
function get_rand_str($len = 12)
{
    if (!is_int($len) || $len < 0) {
        return false;
    }
    $char = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $string = '';
    for ($i = $len; $i > 0; $i--) {
        $string .= $char[mt_rand(0, strlen($char) - 1)];
    }
    return $string;
}
// 存储短链接对应的长链接
function set_cache($real_url, $expire = 3600)
{
    $key = get_rand_str(6);
    // cache 为redis实例, 此处以tp5.1为例, 其他框架需更改为自己的用法
    if (cache($key)) {
        return self::set_cache($real_url);
    } else {
        cache($key, $real_url, $expire);
    }
    return $key;
}

　　2. 更改nginx配置, 将短链接重定向到处理文件

server{
  ....
 
    #短链接(http(s)://xxx.com/s/xxx)重定向到 s文件夹下的share.php处理文件
       location /s/ {
            rewrite ^(/s/)(.*)$ $1/share.php?k=$2;
    }      
}

share.php文件

<?php

/**
 * @desc Class Share 分享处理类
 * @author Ni
 * @date 2020年10月19日10:26:41
 */
class Share
{
    private static $instance;

    private function __clone()
    {
    }

    private $config = null;
    private $redisConf = null;
    private $redisHandle = null;
    private $url = null;

    //构造方法私有化，防止外部创建实例
    private function __construct()
    {
    }

    public static function getInstance()
    {
        //判断实例有无创建，没有的话创建实例并返回，有的话直接返回
        if (!(self::$instance instanceof self)) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    private function init()
    {
        $this->getConfig();
        $this->initRedisHandle();
    }

    /**
     * @desc 获取配置
     */
    private function getConfig()
    {
//        $this->config = include_once './config.php';
        $this->config = [
            'redis' => [
                'host' => '127.0.0.1',
                'port' => 6379,
                // 全局缓存有效期（0为永久有效）
                'expire' => 3600,
                // 缓存前缀
                'prefix' => '',
                'password' => 'you_redis_password'
            ]
        ];

        if (isset($this->config['redis'])) {
            $this->redisConf = $this->config['redis'];
        } else {
            $this->return404();
        }
    }

    private function return404()
    {
        $html = file_get_contents('./404.html');
        echo $html;
        exit;
    }

    private function initRedisHandle()
    {
        try {
            if (!$this->redisHandle) {
                $this->redisHandle = new Redis();
                $this->redisHandle->connect($this->redisConf['host'], $this->redisConf['port'], $this->redisConf['expire']);
                $this->redisHandle->auth($this->redisConf['password']);
            } else {
                return true;
            }
        } catch (Exception $e) {
            $this->return404();
        }

    }

    private function getUrl()
    {
        // 获取get参数k
        $k = isset($_GET['k']) ? $_GET['k'] : '';
        if (!$k) {
            $this->return404();
        }

        // 获取缓存信息
        $cache = $this->redisHandle->get($this->redisConf['prefix'] . $k);
        if (!$cache) {
            $this->return404();
        }
        $this->url = $cache;

    }

    private function redirectUrl()
    {
        if ($this->url) {
            header("Location: $this->url");
        } else {
            $this->return404();
        }
        exit;
    }

    function run()
    {
        $this->init();
        $this->getUrl();
        $this->redirectUrl();
    }
}

$share = Share::getInstance();
$share->run();

附录: 404.html(页面代码来源于网络)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
 
<head>
 
    <meta charset="UTF-8" http-equiv="Content-Type" content="text/html; charset=utf-8" />
 
    <title>404-对不起！您访问的页面不存在</title>
 
    <style type="text/css">
        .head404{ width:580px; height:234px; margin:50px auto 0 auto; background:url(https://www.daixiaorui.com/Public/images/head404.png) no-repeat; }
        .txtbg404{ width:499px; height:169px; margin:10px auto 0 auto; background:url(https://www.daixiaorui.com/Public/images/txtbg404.png) no-repeat;}
        .txtbg404 .txtbox{ width:390px; position:relative; top:30px; left:60px;color:#eee; font-size:13px;}
        .txtbg404 .txtbox p {margin:5px 0; line-height:18px;}
        .txtbg404 .txtbox .paddingbox { padding-top:15px;}
        .txtbg404 .txtbox p a { color:#eee; text-decoration:none;}
        .txtbg404 .txtbox p a:hover { color:#FC9D1D; text-decoration:underline;}
 
    </style>
 
</head>
 
 
 
<body bgcolor="#494949">
 
<div class="head404"></div>
 
<div class="txtbg404">
 
    <div class="txtbox">
 
        <p>对不起，您请求的页面不存在、或已被删除、或暂时不可用</p>
 
        <p class="paddingbox">请点击以下链接继续浏览网页</p>
        <p>》<a href="你的网站首页">返回网站首页</a></p>
 
    </div>
 
</div>
 
</body>
 
</html>
</html>