短网址php源码

<?php
class ShortUrlGenerator {
    private $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    private $base = 62;

    public function generateShortUrl($longUrl) {
        $hash = hash('md5', $longUrl);
        $shortUrl = '';
        for ($i = 0; $i < 6; $i++) {
            $shortUrl .= $this->chars[substr($hash, $i * 8, 8) % $this->base];
        }
        return $shortUrl;
    }

    public function getLongUrl($shortUrl) {
        // 这里需要查询数据库或使用其他方式获取原始长网址
        // 示例代码省略了数据库查询部分
        return 'http://example.com/very-long-url';
    }
}

// 示例使用
$generator = new ShortUrlGenerator();
$longUrl = 'http://example.com/very-long-url';
$shortUrl = $generator->generateShortUrl($longUrl);
echo "Short URL: http://short.url/{$shortUrl}\n";

$originalUrl = $generator->getLongUrl($shortUrl);
echo "Original URL: {$originalUrl}\n";
?>