php md5下16位和32位的实现代码
复制代码 代码如下:
echo substr(md5("admin"),8,16); // 16位MD5加密
echo "
";
echo md5("admin"); // 32位MD5加密
?>
16位的MD5加密用substr函数截取了字符得到实现....
不想深入研究了 :) 要把脑力放到其他关键的地方~~
今天做了个php链接mssql数据库,数据库中的表中字段使用MD5十六加密的。但是php中的MD5默认是32位,导致登录程序没办法使用md5加密跟表中字段匹配,在网上一搜也有不少人有这方面的困惑,后来找到一个解决办法,是正确的,就记录下来。
使用substr函数截取:
substr(md5("admin"),8,16); // 16位MD5加密
md5("admin"); // 32位MD5加密
经过脚本之家测试结果如下:
我们以asp的几个md5后的结果比较
附:如果遇到MD5加密文件,而又不知道的密码的,请在数据库中换上这组加密的数据。
admin---16位加密---7a57a5a743894a0e
admin---32位加密---21232f297a57a5a743894a0e4a801fc3
admin---40位加密---7a57a5a743894a0e4a801fc343894a0e4a801fc3
substr(md5("admin"),8,16); // 16位MD5加密 正是上面的32为从第8个字符开始的16个字符。所以大家不用考虑唯一性的问题。本身就是正确的。网上有人说php5支持
复制代码 代码如下:
echo md5("admin",true);//返回16位,不过这是在PHP5里才有。
经测试输出的结果是乱码,如果大家有什么好的代码,可以分享下。

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