验证码
thinkphp制作后台登陆界面怎样实现验证码不区分大小写？
------解决思路----------------------
最简单的方法 将接收到的东西用函数做转换
------解决思路----------------------
在匹配验证码时 使用函数strtolower/strtoupper将字符串统一大小写后在比对。
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