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php 大小写验证

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Jun 06, 2016 pm 08:10 PM

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我有一个登录注册的功能，当我注册成功AA这个用户时，用aa用户名和AA的密码输入时，居然也成功进入，我估计是大小写出了问题，望指点

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我有一个登录注册的功能，当我注册成功AA这个用户时，用aa用户名和AA的密码输入时，居然也成功进入，我估计是大小写出了问题，望指点

你的数据库字符集是哪一个？可以选择带bin的看看。

最好是统一大写或者是小写，数据库没有特殊设置，是不区分大小写的

一般都会把用户名转成小写再存储，用户名是不应该区分大小写的、
你这种情况应该是拿用户名和密码去数据库里查。返回一条记录就认为成功。
更合理的做法是，只用用户名去查，返回结果后，用if进行密码对比

大部分数据库默认是不区分大小写的，如果你要区分就得先改掉数据库的默认设置。

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