php 字符串变短
需求
$str='topics/new?forum_id=PHP';
echo shortUrl($str) // 输出：js4d8x5d
echo unShortUrl('js4d8x5d') //还原字符串 输出：topics/new?forum_id=PHP
求 shortUrl 和 unShortUrl 函数
回复讨论(解决方案)
没给出编码规则，怎么写程序？
短链接？
hash函数 + hash冲突解决方案
新浪的短url貌似是在服务器存储的url和id号的对应关系。没有研究过
短链接？
hash函数 + hash冲突解决方案
新浪的短url貌似是在服务器存储的url和id号的对应关系。没有研究过
恩 短连接， 对应存储太麻烦了~ 也太多 hash这种类型php系统函数 好多，但是都是单向的。 我理想的是crc32 函数8位结果，但是crc32 也不能反
没给出编码规则，怎么写程序？
就是问这个
仅以计算得出的话，紧缩的空间有限
假定原串不含有中文，则可以用 96 进制表示 0000000 - 1011111
但只能紧缩 1/8
所以短网址都是以查表法实现的，提供的只是表项索引
仅以计算得出的话，紧缩的空间有限
假定原串不含有中文，则可以用 96 进制表示 0000000 - 1011111
但只能紧缩 1/8
所以短网址都是以查表法实现的，提供的只是表项索引
哦~，想学这个网站的url http://hangzhou.8684.cn/z_d7bc763d
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