PHP实现短网址功能，附代码

支持短链接生成、写入数据库，在访问时查询数据库，最终实现跳转功能。数据表设置为索引。

下面附代码：

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/12/17 0017
 * Time: 9:48
 */
 
namespace app\index\controller;
 
use think\Controller;
 
class Duan extends Controller
{
    /**
     * 生成
     * @return mixed
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     * @throws \think\exception\DbException
     */
    public function index()
    {
        $host = 'http://aabb.cn/';
        $url  = 'https://blog.gitee.com/';
        //检测链接是否存在，存在则直接返回
        $res = $this->check($url, 1);
        if($res) {
            echo '生成成功，链接：' . $host . $res;
            die;
        }
        //不存在，生成，写入并返回
        $code = $this->createStr();
        //检测
        $res = $this->check($code, 0);
        if($res) {
            $code = $this->createStr();
        }
        $result = db("sort")->insert(
            [
                'create_time' => time(),
                'update_time' => time(),
                'url'         => $url,
                'code'        => $code,
            ]
        );
        if($result) {
            echo '生成成功，链接：' . $host . $code;
            die;
        } else {
            echo '生成失败';
            die;
        }
    }
 
    /**
     * 检测资源是否存在
     * @param $data
     * @param $type
     * @return array|false|\PDOStatement|string|\think\Model
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     * @throws \think\exception\DbException
     */
    public function check($data, $type)
    {
        if($type) {
            $where['url'] = $data;
        } else {
            $where['code'] = $data;
        }
        $res = db("sort")->where($where)->find();
        if($res and ($type == 1)) {
            return $res['code'];
        }
        if($res and ($type == 0)) {
            return $this->createStr();
        }
    }
 
    /**
     * 生成字符串
     * @return string
     */
    public function createStr()
    {
        $data = [ 
         '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', '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', '6', '7', 
         '8', '9' ];
        $info = array_rand($data, 6);
        $res  = '';
        foreach($info as $k => $v) {
            $res .= $data[$v];
        }
        return $res;
    }
 
    /**
     * 访问链接
     * @param $code
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     * @throws \think\exception\DbException
     */
    public function info($code)
    {
        if(!$code) {
            echo "无法访问";
            die;
        }
        $data = db("sort")->where([ 'code' => $code ])->field('url')->find();
        if(!$data) {
            echo '无法获取连接';
            die;
        }
        $this->redirect($data['url'], 301);
    }
}